Sen. Chris Murphy (D-CT) told the Washington Post be that Republicans are partially culpable for attacks like the Orlando nightclub shooting because they refuse to restrict gun sales to those on the terror watch list.

Said Murphy: “We’ve got to make this clear, constant case that Republicans have decided to sell weapons to ISIS.”

He added: “ISIS has decided that the assault weapon is the new airplane, and Republicans, in refusing to close the terror gap, refusing to pass bans on assault weapons, are allowing these weapons to get in the hands of potential lone-wolf attackers. We’ve got to make this connection and make it in very stark terms.”

Sen. Chris Murphy (D-CT) “has launched a talking filibuster on the Senate floor in an effort to force Republicans and Democrats to come to an agreement on legislation to deny suspected terrorists from purchasing firearms and requiring universal background checks,” Politico reports.