Sen. John Cornyn threw his support behind scrapping the filibuster to pass a voting restrictions bill President Donald Trump has called his “No. 1 priority” in Congress, as the Texas Republican continues to seek the president’s endorsement and stave off a bruising primary runoff election. Trump has held off on endorsing Cornyn, the pick of top Senate Republicans, over Texas Attorney General Ken Paxton in a bid to pressure leadership to lower the threshold of votes needed to pass the SAVE America Act, which would enact citizenship and photo ID restrictions in elections while also targeting transgender rights. Paxton has...