The outcome is slightly uncertain because Republicans, who hold a 53-47 majority, face united Democratic opposition − and the defection of at least two of their own members.Start the day smarter. Get all the news you need in your inbox each morning.

The Senate on Monday morning began a "vote-a-rama" on proposed amendments to President Donald Trump's megabill for his second term priorities.It comes after a rare weekend session for senators, which included a dramatic 51-49 procedural vote on Saturday night to advance the massive tax and immigration bill and a forced reading of the 940-page bill by Democrats.