The Senate parliamentarian plays a key role in budget reconciliation, which congressional Republicans are using to advance the president’s policy goals.. WASHINGTON—Republicans have set the stage to potentially override the Senate parliamentarian as they move ahead with President Donald Trump’s policy proposals. Republicans are seeking to pass Trump’s entire agenda—including tax cuts, energy policy, border policy, defense, and other areas—using the reconciliation process. While this process allows the party to bypass the 60-vote filibuster threshold, which kills most partisan bills on arrival in the Senate, it’s heavily restricted. Rules governing its use prevent these types of bills from having a...