In Nixon's time in office, seven of his presidential vetoes were overridden by Congress. Among those vetoed were the Federal Water Pollution Control Act in 1972 and the War Powers Resolution in 1973.
Nixon supported the Federal Water Pollution Control Act, known as the Clean Water Act, but vetoed it because the cost of the act had been driven to $18 billion. He impounded half of the money after his veto was overridden.
The War Powers Resolution was designed to check the President's authority as Commander in Chief to commit armed forces without Congress' consent or a declaration of war. Nixon disliked the provision because it states that any actions taken by the President are automatically terminated in 60 days, unless Congress takes action. He did not favor Congress having the ability to curtail the President by simply doing nothing.