Senate Republicans, holding a majority under Leader John Thune, face intensifying pressure to invoke the nuclear option—a simple majority vote to reinterpret Senate rules and eliminate the 60-vote filibuster threshold on legislation—amid Democratic opposition to the SAVE Act voter registration reform bill. Recent reports from March 19 highlight active deliberations to bypass the filibuster, spurred by President Trump's calls and House GOP demands, though Thune has emphasized preserving the rule and lacks sufficient support, with senators like Collins voicing reservations. No such change has occurred for legislative matters since prior uses targeted judicial nominees in 2013 and 2017; traders eye upcoming floor votes or procedural maneuvers that could tip the balance before potential year-end deadlines.