Senate Democrats have allowed the Foreign Intelligence Surveillance Act to expire as of Saturday, marking an escalation in their opposition strategy against President Donald Trump's policies and appointments. The move represents a shift from Democrats' approach a year ago, when Senate Democratic Leader Chuck Schumer faced criticism from his party for working with Republicans to keep the government open.

The immediate trigger for blocking FISA renewal was Trump's appointment of federal housing regulator Bill Pulte to temporarily lead the nation's intelligence agencies. Democrats and some Republicans have criticized Pulte's lack of national security experience, with lawmakers from both parties urging Trump to withdraw the appointment throughout the week. Trump nominated a permanent replacement, Jay Clayton, on Thursday after lawmakers left Washington, but the confirmation process will take time and Trump has not removed Pulte from the interim position.

Senate Majority Leader John Thune criticized Democrats for playing "fast and loose" with national security, pointing to a 43-day government shutdown last fall and delays in immigration enforcement funding. Republicans argue the timing is particularly dangerous given ongoing World Cup events and upcoming celebrations for the nation's 250th anniversary. However, Democrats contend that Pulte poses a greater security risk, noting his background investigating political figures Trump considers adversaries.

The strategy reflects Democrats' growing unity and willingness to use legislative tools to gain leverage in a Republican-controlled Congress. While previous efforts like the fall shutdown and immigration funding delays did not yield major policy victories, Democrats have remained more cohesive in recent fights. Senate Intelligence Committee Vice Chair Mark Warner acknowledged the approach carries risks but said "this didn't have to happen."

Republican senators find themselves caught between Democratic opposition and Trump's actions, which have sometimes complicated their legislative agenda. Trump's decision to back primary challenges against incumbent Republican senators has further strained relationships, with Senators John Cornyn and Bill Cassidy, who lost primaries to Trump-backed candidates, joining Democrats in criticizing Pulte's appointment. The confirmation timeline for Clayton and whether Democrats will support his nomination remains unclear.