Tillis’s decision puts Democrats on the brink of being able to block Trump’s emergency declaration in the Senate. If the resolution of disapproval passes the Senate it will go to the president’s desk, where he has said he will use his first veto.
If all 47 Democrats for the resolution they would need to flip four Republican senators in order for the resolution to pass the Senate. The vote needs a simple majority.
GOP Sens. Susan Collins (R-Maine) and Lisa Murkowski (R-Alaska) are both viewed as likely yes votes, which would make Tillis the third Republican defector. Both Tillis and Collins are up for reelection in 2020 and viewed as targets as Democrats look for ways to pick up seats.
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