Republicans in Congress may soon have to appropriate federal funds to insurers they fought to hold off for several years under Obamacare, or otherwise risk being blamed for a chain reaction of insurer exits and premium hikes.

President Trump is expected to issue a decision as early as Tuesday on whether his administration will continue to deliver these payments to insurers, known as cost-sharing reduction subsidies. If he chooses to end them, members of Congress have signalled that they may consider appropriating the funds.