It is quite unusual for the Trump administration to negotiate legislation that turns off most members of Congress in President Donald Trump’s own party. If all Senate Democrats supported the legislation, it would still need more than a dozen Republicans to clear the 60-vote threshold needed to overcome a filibuster.

And GOP leaders are looking dimly at the prospect of waltzing a bill with mostly Democratic support through the Senate, even if it does have the president’s backing.

Republicans’ “natural instinct, depending on how big it is, and what’s in it, is probably going to be to be against it,” said Senate Majority Whip John Thune (R-S.D.). “I think we’re going to have a hard time finding 13 votes for anything.”