Finally. Republicans can guarantee themselves the minority if they fail on this key promise.

Vice President Mike Pence cast the tiebreaking vote.

In a dramatic moment, Sen. John McCain returned from Arizona to applause from fellow senators. He cast a necessary Republican vote for the motion after two GOP senators — Susan Collins and Lisa Murkowski — sided with all Democrats in opposition.

As the vote began, protesters in the Senate gallery shouted “kill the bill” and “shame, shame, shame!”

The vote came as Senate Majority Leader Mitch McConnell and President Donald Trump dared their fellow Republicans to block their seven-year campaign promise to repeal and replace Obamacare.