The F.B.I. director, James B. Comey, asked the Justice Department this weekend to publicly reject President Trump’s assertion that President Barack Obama ordered the tapping of Mr. Trump’s phones, senior American officials said on Sunday….

Roger Stone, a confidant to President Donald Trump and former adviser to his campaign, acknowledged late Saturday that he had a “back channel” to WikiLeaks founder Julian Assange, amid mounting reports that multiple advisers to…