Senate Republicans are preparing to use the filibuster to block Democrats from voting to create a 9/11-style commission to study the January 6 insurrection at the U.S. Capitol. Debate over a key procedural vote on the commission stretched until about 3 a.m. this morning without resolution.

Meanwhile, Senate Minority Leader Mitch McConnell is reportedly calling fellow Republicans and asking them to support a filibuster of the bill as “a personal favor.” Alaska Republican Lisa Murkowski accused McConnell of blocking the commission for political gain. Murkowski and just two other Republican senators — Mitt Romney and Susan Collins — support the commission’s creation.

On Thursday, the mother and girlfriend of Brian Sicknick, the police officer who died a day after he was attacked by the pro-Trump mob at the Capitol, personally met with Republican senators to press them to support the commission.