The party’s split over supporting a spending extension to avert a lapse in government funding boiled down to a practical question of how much power the president has in a shutdown.

The spending measure, which passed the House earlier in the week, was presented to the Senate as a take-it-or-leave-it proposition. The vote in the Senate was 62-38, with 37 Democrats opposing the bill along with Republican Sen. Rand Paul of Kentucky, who wanted the measure to codify Trump’s cuts to foreign aid.

The Senate is nearing a key test vote as lawmakers work to avoid a partial government shutdown with just hours to spare.