Final answer:
To ensure a vetoed bill becomes law, Congress should try to override the veto with a two-thirds majority in the Senate.
Step-by-step explanation:
If the President vetoes a bill passed by Congress, the most likely action by Congress to ensure that the bill becomes law is to try to override the veto with a two-thirds majority in the Senate. This is because according to the information given, if Congress can gather enough support in the Senate to override the veto, the bill will become law despite the President's objection. Reintroducing the same legislation or amending it with a simple majority in the House and Senate may still face the President's veto.
Learn more about Congress's actions to override a presidential veto