What a Democratic congressional majority would make harder for Trump

According to Reuters, Donald Trump's administration is preparing for a possible loss of the Republican congressional majorities. White House staff have reportedly been examining for months which projects the president could pursue without new legislation. These include immigration rules and tariffs. At the same time, government lawyers are preparing for congressional investigations.

Whether this scenario materialises is up to voters on Tuesday, 3 November 2026. All 435 seats in the House of Representatives and 35 Senate seats, including special elections, are up for vote. A new majority would be a gain in power for the opposition. But it would not automatically strip the president of his office or of his existing powers.

A single chamber is enough to stop new laws

For a federal law, the House of Representatives and the Senate must pass the same text. It then goes to the president. This is how the House of Representatives describes the legislative process. If the Democrats control only one chamber in future, they can halt there projects for which Trump needs a new legal basis.

The blocking mechanism also works the other way round. A Democratic bill does not pass Congress simply because it wins a majority in the House. It also needs the Senate's approval. And Trump could reject a passed text with his veto.

Overriding that veto would require two-thirds majorities in both chambers. A narrow Democratic majority would not be enough. The political difference between opposing a project and enacting a lasting new rule oneself is correspondingly large.

In the Senate, a simple majority is not the only thing that counts

For many legislative projects, another hurdle comes on top. With a filibuster, senators can extend debate and delay or prevent a vote. Under the usual rule, ending debate requires three-fifths of the senators duly chosen and sworn, which with full attendance means 60 votes. This threshold must be distinguished from the subsequent vote on the substance.

A party with a narrow majority would therefore have to win votes from the other side on many bills. However, the rules do not apply uniformly to every procedure. In particular, the figure of 60 votes is not a general quorum for all decisions of the Senate.

For major appointments, the Senate is responsible. The Constitution requires its consent, for example for federal judges and numerous senior government posts. A Democratic Senate majority could therefore halt such candidacies. A majority in the House alone would not have that power. A possible seat on the Supreme Court would not be filled by the House either.