What if there's a tie vote? Everything you need to know about a tie in Trump's trial
Ahead of the vote expected on Friday afternoon on whether to call witnesses at President Donald Trump's impeachment trial, GOP Senate leaders believe they will have just enough votes to block additional testimony and documents.
"I think we can all agree this is a big day," said Senate Majority Leader Mitch McConnell, R-Ky.
For witness testimony to be approved, four Republican senators would need to vote alongside all Democrats. Republicans have a 53-seat majority in the 100-member Senate.
In another possible scenario, three GOP lawmakers vote for witnesses, making it a 50-50 tie — under which the resolution would be defeated. But Supreme Court Chief Justice John Roberts, who is presiding over the trial, could weigh in as a 101st vote, although that's not anticipated.
Read what could happen Friday afternoon.