Rep. Nancy Mace (R-S.C.) told Axios she will "most likely" vote for House Democrats' resolution to constrain President Trump from waging war with Iran the next time it comes up for a vote.Why it matters: The vote is symbolic — even if the measure passed both chambers, Trump could veto it — but Mace's support puts the House one step closer to a major rebuke of the administration's Middle East operations.Mace emerged as a suddenly fierce critic of the Iran war this week, declaring Wednesday that she will vote against funding further operations in the region.But she went a step further on Thursday, telling Axios in a text message: "War with Iran needs to end. President Trump has won the war, time to exit.""I'm not voting to send South Carolina's sons and daughters into battle to die for the price of oil," she said.State of play: Mace voting for the war powers resolution could spell defeat for House Speaker Mike Johnson (R-La.).A war powers resolution forced to the floor earlier this month was rejected in a 212-219 vote, with four House Democrats breaking away from their leadership and voting against the measure.But most if not all of those Democrats are poised to flip the next time their party leadership forces a war powers vote, Axios reported on Tuesday.There is little indication that Reps. Warren Davidson (R-Ohio) and Thomas Massie (R-Ky.), the two Republicans who voted for the war powers resolution last time, will flip and side with GOP leadership.