Answer:
The US president can check Congress by vetoing legislation.
Step-by-step explanation:
Veto is the opposition of a body, person or authority, which has this competence, to a valid deliberation emanating from another, which prevents that deliberation from producing legal effects. It is used especially in constitutional law, meaning the denial of sanction by the head of the executive branch to the law drawn up by the legislative branch. In the United States, the president has veto over Congress decisions, and such a veto can only be invalidated if a 2/3 majority can be won for the proposal.