In U.S.A. all the the law – making powers have been given to the Congress. However, the President and the judiciary have been empowered through checks and balances to control the despotic tendency in the Congress. The President has a right to opine on the law – making agenda of the Congress and can send his clear message to the Congress.
The Congress, after passing a bill, will send it to the President for his approval. Then and then alone it can become a law fit to be enforced. Regarding the approval, the President has veto power to reject any bill sent for approval without assigning any reason. The Supreme Court, through its power of judicial review, can reject any law.