F.B.I. search warrants shed new light on the degree to which Stephen Paddock planned the attack and prepared for the aftermath to come.
Secretary of State Rex W. Tillerson is opening an investigation into what the government has described as mysterious attacks that sickened or injured 24 Americans in Havana in 2016.
White House officials viewed it as a sign the special counsel’s inquiry was nearly over. But it touched off discussions about the perils of the president sitting for an interview.
The first congressional criminal referral in connection with Russian meddling targeted a former British spy, not anyone accused of conspiracy.
Career prosecutors shut down the case in 2016 over lack of evidence. The new interest comes as Mr. Trump has taken the highly unusual step of calling for investigations into political rivals.
The special counsel’s investigation has uncovered several incidents involving the president that raise questions about whether he obstructed justice.