The North Carolina Republican spoke against U.S. President Donald Trump's bill and said he would not seek reelection when his term ends.

The US Senate will begin voting on a massive spending plan, dubbed the "big beautiful bill", on Monday after weeks of contentious negotiations. Republicans - who control both chambers of Congress - were divided over how much to cut welfare programmes in order to extend tax breaks.

The Senate is slogging through an overnight session as Republican leaders search for ways to secure support for President Donald Trump’s big bill of tax breaks and spending cuts.