Republicans in Congress will face a wrenching choice if President Trump follows through on decertifying the Iran nuclear deal.

Decertification would unlock a fast-track procedure for Congress to reimpose sanctions, leaving Republicans with two unappealing options.

Snap back the sanctions, and Iran likely walks, killing an agreement that top administration officials say is in the national interest. Do nothing, and the deal likely stands, preserving a pact that Republicans have lambasted for years.

For now, it appears that Republicans have little appetite for reviving the sanctions. Yet the pressure from hard-liners to act will be intense.