Republican divisions have already forced McConnell to delay the unveiling of the $1 trillion proposal he released on Monday, an embarrassing setback for the party at a critical moment. McConnell has also openly said the plan would have “fairly significant support” among Senate Republicans but “probably not everyone” — which is as close to a tell as McConnell gets to admitting his cards aren’t very strong.

And then there’s Donald Trump and White House officials, who seem more concerned with saving the president’s political career than they are about preserving GOP control of the Senate. For Republicans, working with the White House to craft a unified position hasn’t always been easy these past few weeks; Treasury Secretary Steven Mnuchin and White House chief of staff Mark Meadows have repeatedly altered some of their demands during closed-door discussions with McConnell and other top Republicans during that period, or staked out positions they know Senate GOP leaders can’t support, according to sources familiar with the talks.