WASHINGTON (AP) — Senate Republicans are ready to deploy the filibuster to block legislation establishing a commission on the deadly Jan. 6 insurrection. Thursday’s would be the first successful use of a filibuster this year to halt Senate action. That’s despite both a bipartisan effort to salvage the bill and a last-minute push by the mother of a Capitol Police officer who died after the siege. The filibuster is a time-honored Senate tradition that requires a vote by 60 of the 100 members to cut off debate and advance a bill. With the Senate evenly split 50-50, Democrats would need support of 10 Republicans to move to the commission bill.