A week after the Senate rebuffed Trump’s military action in Venezuela, the fate of a rare war powers resolution remains in doubt, as a handful of Republicans face pressure to walk it back. Senators will have to make a choice on Wednesday when the chamber considers final votes on the resolution to block Trump’s ability to use military force again in Venezuela without Congressional approval.

When the Senate voted on Jan. 8 to move forward with the resolution, that procedural vote passed 52-47, with five Republicans joining all Senate Democrats. It was a clear rebuke of Trump’s action in Venezuela, which he authorized without giving advance notice to the members of the Senate Armed Services committee. In the intervening days, Trump and Secretary of State Marco Rubio have worked the phones to try to convince some of those Republicans to back off the resolution when it comes up for a final vote.

By late Tuesday, the question of whether the Senate would follow through on the resolution was in doubt. Even if the legislation passes the Senate, it is unlikely to become law, as it would still need to be approved by the Republican-controlled House and signed by Trump.