The amendment will need a majority vote in the House to be adopted, which could happen if Democrats get behind the proposal. But the more changes conservatives can pile onto the amendment, the less likely it is that Democrats will get behind it.

Still, even if Democrats don’t vote for the Fitzpatrick amendment, the vote will likely accomplish one big goal for the House GOP: to give vulnerable Republicans the chance to go on record in support of extending the subsidies.

“There’s perhaps no single policy measure that would have a more dramatic impact on affordability in the year ahead than doing something about the expiration of these subsidies,” said Rep. Kevin Kiley, R-Calif., who district was divided up as part of the Democratic-led redistricting effort in California.