The briefing was announced on Monday, a virtual lifetime ago in a week that has featured several revelations related to the F.B.I.’s investigation into Russian interference in the 2016 election — including a report by The New York Times detailing how Mr. Trump asked Mr. Comey to drop an investigation into Michael T. Flynn, Mr. Trump’s first national security adviser.
Republicans and Democrats want more information, with several congressional committees inviting Mr. Comey to testify. But Thursday’s briefing is seen as an important step in obtaining that information.
While it will happen behind closed doors, “I hope that much of what we learn today can be shared with the American public,” said Senator Chuck Schumer of New York, the Democratic leader.
Mr. Rosenstein will also brief members of the House on Friday at 10 a.m.
— Emmarie Huetteman on Capitol Hill
How Trump found out
The president learned of Mr. Rosenstein’s decision around 5:35 p.m. on Wednesday when the White House counsel, Donald F. McGahn II, walked into the Oval Office to tell him.
Mr. Trump, who was looking through papers, reacted calmly but defiantly at first, according to two people familiar with the events, saying he wanted to “fight back.” Realizing the seriousness of the situation, he quickly summoned his staff, including Sean Spicer, the press secretary; Michael Dubke, the communications director; Mr. Trump’s son-in-law, Jared Kushner; Reince Priebus, the chief of staff; Hope Hicks, a longtime aide; Kellyanne Conway, a senior adviser; and Stephen K….