Republican senators are rallying around their calls to abolish the filibuster following the shooting at the White House Correspondents’ Association dinner over the weekend, a move they say is now more vital than ever to end the Department of Homeland Security shutdown.

Democrats have used the 60-vote threshold since Feb. 14 to block agency funding after policy negotiations broke down on federal immigration enforcement, and the GOP-led House has not approved a Senate-passed measure to fund most of DHS except for U.S. Customs and Border Protection and Immigration and Customs Enforcement.