President Donald Trump announced Saturday that he will not sign any legislation into law until the Senate passes the SAVE Act, a controversial voting restriction measure that has stalled in the upper chamber for months, according to reporting by The Hill.

The declaration, made via social media, marks an unprecedented use of executive power to pressure Congress on a single legislative priority. Constitutional scholars immediately questioned whether a president can effectively refuse to sign any legislation as a bargaining tactic, noting that such a stance could halt essential government operations including appropriations bills and emergency funding.

"This is not how the legislative process is supposed to work," said Sarah Chen, a constitutional law professor at Georgetown University. "The president has the power to veto individual bills, but threatening a blanket refusal to sign anything creates a constitutional crisis."

The SAVE Act, which would require proof of citizenship for voter registration and impose stricter ID requirements at polling places, has divided lawmakers along partisan lines. Republicans argue the measure is necessary to prevent non-citizens from voting, though multiple studies have found such cases to be exceedingly rare. Democrats contend the bill would disproportionately disenfranchise minority voters and students who lack easy access to citizenship documents.

The legislation passed the House last year but has languished in the Senate, where neither party has 60 votes to overcome a filibuster. Senate Majority Leader's office did not immediately respond to requests for comment on whether Trump's ultimatum would change the chamber's legislative strategy.

The timing raises immediate concerns about pending government operations. Congress must pass a continuing resolution by March 28 to avoid a partial government shutdown, and several federal agencies are awaiting reauthorization. Trump's vow suggests he might refuse to sign even these critical measures unless the SAVE Act advances.