Final answer:
When a bill passes both houses with changes, a reconciliation process must occur before it becomes law. This is often done through a conference committee. If the president vetoes the bill, a two-thirds vote in Congress is required to override the veto.
Step-by-step explanation:
When a bill passes both the House of Representatives and the Senate, but with minor changes from the original version, it must go through a reconciliation process before becoming law.
This is typically done through a conference committee, which negotiates a version of the bill that both chambers can accept without any further amendments. Once a reconciliation is reached, the bill can then progress to the president's desk for signature or veto.
If the president vetoes the bill, both chambers of Congress would need to muster a two-thirds vote to override the veto and make the bill law without presidential approval.