Senate Republicans are reeling after President Trump abruptly threatened to withhold his signature from a widely supported housing affordability bill, a move several GOP lawmakers described as politically baffling and damaging ahead of the midterm elections. The legislation, known as the 21st Century ROAD to Housing Act, had been touted as a major achievement by Senate Majority Leader John Thune (R-S.D.) and passed both chambers with overwhelming bipartisan support.

Trump’s decision to cancel a signing ceremony for the bill—without issuing a full veto—means the measure could still become law after a 10-day waiting period, unless the president actively vetoes it. But the political fallout from his public opposition has unsettled many in his own party.

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“I don’t know if there’s a precedent for it,” said Sen. John Cornyn (R-Texas), calling the move “inexplicable.” Sen. Susan Collins (R-Maine) echoed that sentiment, telling reporters, “It makes no sense. This bill has very strong bipartisan support in both the House and the Senate. The primary author is a Republican senator, and it addresses an issue that affects many American families who find the cost of housing to be a tremendous burden.”

The lead Senate Republican sponsor of the housing bill is Banking Committee Chair Tim Scott (R-S.C.), who declined to comment on Trump’s threat. One GOP senator, speaking anonymously, warned the move was “not a very good move” and risked handing Democrats a campaign issue. The tension comes as the party also faces internal divisions over fiscal conservatives resisting Trump's $1.5 trillion defense funding push.

Trump said Wednesday morning he would not sign the housing bill until the Senate passes what he called “the desperately needed SAVE America Act.” That measure, the Safeguard American Voter Eligibility Act, would require documented proof of citizenship to register and photo ID to vote. Trump has made it his top legislative priority, but the bill lacks the 60 votes needed to overcome a Democratic filibuster.

Sen. Mike Lee (R-Utah) has been pushing GOP leaders to force a talking filibuster on the SAVE Act, a strategy many Senate Republicans reject as unworkable. Cornyn criticized colleagues for encouraging Trump’s stance, saying, “I just don’t understand what they’re doing, what the point is. We do have midterm elections coming up here.” He added that the president’s apparent goal of eliminating the filibuster has no path to 50 votes.

Sen. Thom Tillis (R-N.C.) was blunt: “I don’t know why you’re holding a bill that’s ready for signature hostage over a bill that will never pass this Congress. It makes no sense to me.” He warned that the standoff was “a huge gift to the Democrat party.” The internal GOP rift echoes earlier clashes, such as when Trump clashed with Sen. Bill Cassidy over the SAVE Act, deepening party divisions.

Some GOP senators expressed hope the housing bill would still become law after the 10-day window. “I assume in 10 days it goes into law,” said Sen. James Lankford (R-Okla.), the vice chair of the Senate GOP conference. Sen. Steve Daines (R-Mont.), an adviser to leadership, said, “We need to get it signed. Hopefully we can work through this. It’s an important win.”

The episode underscores the broader political challenge for Republicans as they try to balance Trump’s demands with the need to deliver tangible wins on issues like housing affordability. With midterm voters focused on rising costs, several GOP senators worry that a stalled housing bill could become a liability. Meanwhile, the SAVE Act faces an uncertain future in the Senate, especially after a federal judge permanently blocked a similar Trump executive order requiring citizenship proof for voting.