If the president vetoes a bill, the

executive branch can override the veto with a 2/3 vote

legislative branch can override the veto with a 2/3 vote

executive branch can appeal the veto to the Supreme Court

legislative branch can appeal the veto to the Supreme Court

Verified Answer :

If the president vetoes a bill, the "legislative branch can override the veto with a 2/3 vote," since this is one of the ways in which the legislative branch acts as a "check" to executive power.