Which of the following is a constitutional check on the president's powers?

the power to veto a law

the power to override a veto

both "a" and "b" are checks on the president's powers

neither "a" nor "b" are checks on the president's powers

The correct option is "the power to override a veto"

A law passed by a simple majority in both houses of Congress is enacted, or acquires the force of law, in one of the following ways:

1. Signature of the President of the United States.

2. Not being subject to a presidential veto in the next ten days (Sundays excluded), while the Congress is in session.

3. Reconsideration by Congress after a presidential veto during its session (a bill must receive a 2/3 majority vote in both houses to overcome the president's veto).

cuban communists pressured the soviet union to place missiles in cuba.

here is a link that will you.