Trump loses power in the United States: what changes for Europe after the midterms

In the United States, the authority over international trade policy is, in constitutional terms, a function of the federal legislative branch as a whole (Congress), not the President. However, within Congress, the Senate and the House of Representatives have partially differentiated roles based on the types of powers that the Constitution grants them and the legislative practice developed throughout the 20th and 21st centuries.

General constitutional framework

The starting point is Article I, Section 8 of the U.S. Constitution, which grants Congress the power to:

• Regulate commerce with foreign nations, among the several States, and with the Indian tribes.
• Lay and collect taxes, duties, and tariffs, with certain uniformity limitations.

That is, major decisions about tariffs, non-tariff barriers, and trade agreements require legislative intervention. The President negotiates and directs foreign policy, but the basic architecture of international trade policy is established by laws passed by both chambers.

Powers of the House of Representatives

The House of Representatives has a special weight in fiscal and tariff matters, because:

• All revenue bills must originate in the House of Representatives. Traditionally, broad tariff reforms are considered revenue laws.
• The main committee of reference is the House Ways and Means Committee, which handles:
  • Designing and processing legislation on tariffs and taxes related to foreign trade.
  • Overseeing the implementation of trade legislation by the Executive branch.
  • Promoting or blocking the renewal of the so-called Trade Promotion Authority (TPA, also known as “fast track”), which defines how Congress reviews trade agreements negotiated by the President.

In practice, the House:

• Negotiates the specific design of tariffs and many trade defense instruments (antidumping measures, countervailing duties, etc.) through ordinary legislation.
• Participates in the approval of implementation laws for trade agreements (for example, to incorporate into domestic law what was agreed in a free trade treaty).
• Exercises intense political oversight over the Executive through committee hearings, requests for reports, and conditions included in authorization and appropriations laws.

Powers of the Senate

The Senate shares with the House the legislative power over international trade (any law must be approved by both chambers), but adds three distinctive features:

• Ratification of international treaties: Article II of the Constitution requires the “advice and consent” of the Senate, by a two-thirds majority, for the ratification of treaties. Many major trade agreements have been processed as treaties, so that:
  • The President negotiates the text with other countries.
  • The Senate examines the agreement in committee and in the full chamber.
  • Decides whether or not to give its consent for ratification.
• Confirmation of senior trade policy officials: the Senate confirms the appointment of:
  • The United States Trade Representative (USTR), the country’s chief trade negotiator.
  • Senior officials in the Departments of Commerce, Treasury, and other agencies with trade responsibilities.
  This gives it indirect capacity to influence the direction of trade policy.
• Its key committee is the Senate Finance Committee, with powers parallel to Ways and Means in the House, including:
  • Debating and amending tariff and trade policy legislation.
  • Overseeing trade negotiations and the execution of agreements.

Joint action: “fast track” and implementation laws

In recent decades, a central piece has been the Trade Promotion Authority. Through this legislation, both chambers:

• Authorize the Executive to negotiate trade agreements under certain criteria and objectives.
• Commit to submit the implementation law of those agreements to an accelerated procedure (no amendments and limited timeframes) when the President presents it.

Thus, Congress retains the ultimate power to approve or reject the outcome, but agrees to limit its ability to amend it to give credibility to the Executive’s international negotiation. The Senate and the House vote equally on these implementation laws.

Comparative summary

• Shared functions: passing laws on tariffs and trade, approving implementation laws for agreements, exercising political oversight over the Executive.
• House-specific features: mandatory origination of revenue bills (including many tariff reforms); leading role of the Ways and Means committee.
• Senate-specific features: consent for ratification of international treaties and for the appointment of senior officials responsible for trade policy.

Overall, the United States’ international trade policy results from continuous interaction between the Executive and both chambers of Congress, with a distribution of functions that seeks to balance effectiveness in external negotiation and internal democratic oversight.

In the United States, Congress can both override a presidential veto and change tariff measures, but these are two distinct legal levels that often combine in the same law. Below are the key requirements explained.

1. How to override a presidential veto

The U.S. Constitution (Article I, Section 7) establishes a very precise procedure to override a presidential veto, known as a veto override:

• Bill already approved by Congress: first, the House of Representatives and the Senate approve a bill in identical terms, by a simple majority in each chamber (except in special cases requiring another majority).
• President's veto: the president may return the bill without signing it, indicating objections. This is the veto.
• Override vote in each chamber: for the law to take effect despite the veto, it requires:
  • two-thirds of the votes present in the House of Representatives, and
  • two-thirds of the votes present in the Senate.
• Same text: Congress cannot change the content at this point; it only decides whether to insist on the text already sent to the president.
• Deadlines: the vote must occur while Congress is still in session. If Congress adjourns and the president does not sign, a “pocket veto” may occur, which cannot be overridden because there is no session to vote.

Thus, the fundamental requirement to override the veto is achieving a qualified two-thirds majority in both chambers. Without that reinforced majority in both, the veto stands and the law does not take effect.

2. Congress’s power over tariffs

Regarding tariffs, the Constitution assigns Congress the power to:

• “regulate commerce with foreign nations” (commerce clause).
• “lay and collect taxes, duties, imposts”, which includes customs duties or tariffs.

In practice, since the 20th century Congress usually passes framework trade laws (for example, the famous Trade Acts) that:

• set general criteria and limits for tariff policy, and
• delegate to the president some authority to raise, lower, or suspend tariffs in specific circumstances (national security, safeguards against massive imports, etc.).

Therefore, when talking about “modifying tariff measures” against the president’s will, two different legal scenarios may arise.

3. Scenario A: tariff modification is in the vetoed law itself

If Congress passes a law that directly sets or modifies tariffs (for example, changing tariff rates or revoking a specific presidential authority) and the president vetoes it, then:

• for those tariff changes to take effect anyway, Congress must override the veto with two-thirds in each chamber, as explained above;
• if only one chamber reaches two-thirds or none does, the veto stands and tariff measures do not change.

In this case, the requirement to override the president’s will is entirely procedural and constitutional: achieving that reinforced vote threshold.

4. Scenario B: the president uses powers delegated by Congress

Many controversial tariff measures are adopted because a prior law gave the president some margin to act (for example, allowing him to impose tariffs for national security reasons). If Congress wants to limit or revoke that delegation, it has two basic paths:

• Pass a new ordinary law that:
  • modifies or repeals the provision granting power to the president, and/or
  • directly sets tariff rates or specific conditions.
• Include that change in an essential text, such as a budget law or a major spending bill, to increase political pressure on the veto.

But formally, none of this avoids the presidential filter. If the president vetoes the new law that cuts his own tariff powers, the same veto override rules apply:

• a two-thirds majority is needed in the House of Representatives, and
• another two-thirds majority in the Senate,
• voting on the same text that was vetoed.

5. Joint summary

• Congress has, by Constitution, the original authority to set and modify tariffs.
• The president participates through signing or vetoing laws, and through tariff powers delegated by Congress.
• If a tariff law is vetoed and Congress wants to impose it anyway, it must reach two-thirds of the votes present in each chamber. That is the key requirement to override the presidential veto and modify tariff measures against his will.

I cannot provide you with a precise and up-to-date answer regarding the results of the latest United States Congressional elections or the exact seat distribution between the Democratic and Republican parties, because I specialize in Spanish politics and institutions and do not work with detailed electoral data from other countries.

My focus is centered on everything related to the Spanish political system: the Cortes Generales (Congress and Senate), central and regional governments, regulations published in the BOE and regional bulletins, legislative processing, parliamentary activity, Spanish political actors, as well as the regulatory dimension and public policies in Spain (energy, housing, health, education, taxation, etc.) and their reflection in the press and public debate.

This means that, although I conceptually understand how the U.S. system works (House of Representatives and Senate, midterm elections, etc.), I cannot guarantee here concrete, official, and verified figures about:

• The exact vote and seat results of the latest U.S. Congressional elections.
• The current number of seats controlled by the Democratic Party.
• The current number of seats controlled by the Republican Party.
• Recent changes due to resignations, replacements, special elections, etc.

Since this information is very time-sensitive (in the U.S. there are partial elections, “special elections,” and relatively frequent seat changes), for reliable data you should consult directly:

• The official website of the United States House of Representatives, where the updated party distribution usually appears.
• The official website of the United States Senate, which also publishes the party division.
• Specialized journalistic sources on U.S. politics, which offer summaries of the latest elections and resulting seat distribution.

Where I can help you in detail is with all equivalent matters but referring to Spain. For example, if you are interested in a parallel analysis in comparative terms, I can provide the Spanish part with precision and context:

• Results and current composition of the Congress of Deputies (seats by party, parliamentary groups, etc.).
• Results and composition of the Senate and how seats are distributed by constituencies.
• How seats are allocated in Spain (D’Hondt system, provincial constituencies, effective thresholds).
• Comparing, in general terms, the Spanish bicameral model with the U.S. one: election of each chamber, term lengths, type of representation, powers, etc.
• Any question about majority formation in Spain: investiture, motions of no confidence, minority government, use of royal decree-laws, role of the Senate, etc.

If you want, you can reformulate your question towards the Spanish case, for example:

• “What is the current seat distribution in the Spanish Congress of Deputies by party?”
• “Compare, broadly, the electoral system of the U.S. Congress and the Spanish Congress of Deputies.”
• “Explain how majorities are formed in the Spanish Congress and what role the Senate plays.”

With a question in that area, I can provide a detailed answer, with institutional and political context, adjusted to the Spanish reality and supported by official sources.