President Donald Trump’s tariff threats on Greenland could be the final straw for House Republicans who have sidestepped his repeated use of emergency powers.

For months, Speaker Mike Johnson (R-LA) has been able to insulate Trump from congressional opposition to his global tariffs, passing language that blocks any Democratic attempt to repeal them on the House floor. But that maneuver has an expiration date at the end of the month, and Republicans would need to extend it by Friday.