It's a drive GOP leaders concede they can't afford to lose.
A day before the House planned votes on the measure, Trump was expected to continue hunting support for what would be a significant achievement for his young presidency.
A senior administration official said 20 to 25 House Republicans remained opposed or undecided. That's a grave figure since united Democratic opposition means the measure fails if 22 GOP lawmakers vote "no."
The official spoke on condition of anonymity to discuss internal White House vote counting.
Trump told lawmakers a loss "is not acceptable." That's according to someone who attended the closed-door meeting.