WASHINGTON (AP) — Senators hunkered down Monday to consider proposed amendments to President Donald Trump’s big bill of tax breaks and spending cuts amid challenges including the weekend announcement from one GOP senator that he won’t run for reelection after opposing the package over its Medicaid health care cuts.

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.

Senate Republicans can afford to lose no more than three of their own votes on the bill, but two already are opposed and others remained undecided.