What check does the U. S. Senate have on the president?

The Senate can override a veto with a 2/3 majority vote. The Senate can also convict a President in an impeachment trial with a 2/3 vote.

The Senate also checks the President by having the power to approve or not approve the treaties he makes with other nations. The Senate also approves the appointments that the President makes to his Cabinet, ambassadors, federal judges, and all civilian employees of the government who are not covered by another area.

The answer is a. executive branch