Answer:
A president can veto a bill from Congress if he does not approve of it. A veto means he sends the bill back to the house where it originated with his objections. Congress can make the bill law despite the veto if they pass it again by a 2/3 favorable vote in both houses of Congress. Otherwise, the bill dies.
Also, if the president takes no action on a bill before the time for the president's action expires, and Congress is no longer in session at that time, the bill is automatically vetoed. That is referred to as a pocket veto.
Step-by-step explanation: