Attorney General William Barr portrayed himself as an apolitical elder statesman at his confirmation hearing. He declared he'd rather resign than be asked to fire special counsel Robert Mueller without cause and insisted the prosecutor he'd known for decades would never involve himself in a witch hunt as the president claimed. But now Barr has emerged as arguably the most divisive figure in Donald Trump's administration. House Speaker Nancy Pelosi accused him on Thursday of lying — a charge the Justice Department called reckless and false — and House Democrats are poised to hold him in contempt. His appearance before...