Which of the following is NOT a check that the Legislative Branch has over the Executive Branch?

A. can impeach the president

B. approves presidential nominations

C. declare presidential acts unconstitutional

D. controls the budget

C. Declaring presidential acts unconstitutional is NOT a check that the Legislative Branch has over the Executive Branch.

The Judicial Branch is the branch of government that has power to declare a presidential act unconstitutional. The Judicial Branch also exercises that check over against the Legislative Branch, having authority to declare a law passed by Congress as unconstitutional.

The other three items listed - - budget, approval of nominations, and impeachment - - all are powers the Legislative Branch can exercise as a check and balance on the Executive Branch.

The Legislative Branch cannot "declare presidential acts unconstitutional," since this is one of the ways in which the judicial branch checks power, through the act of "judicial review".