A united front of top intelligence officials and senators from both parties on Thursday forcefully reaffirmed the conclusion that the Russian government used hacking and leaks to try to influence the presidential election, directly rebuffing President-elect Donald J. Trump’s repeated questioning of Russia’s role. They suggested that the doubts Mr. Trump has expressed on Twitter about the agencies’ competence and impartiality were undermining their morale. “There’s a difference between skepticism and disparagement,” James R. Clapper Jr., the director of national intelligence, said at a hearing of the Senate Armed Services Committee on the Russian hacks. He added that “our assessment now is even more resolute” that the Russians carried out the attack on the election. The Senate hearing was the prelude to an extraordinary meeting scheduled for Friday, when Mr. Clapper and other intelligence chiefs will repeat for Mr. Trump the same detailed, highly classified briefing on the Russian attack that President Obama received on Thursday. In effect, they will be telling the president-elect that the spy agencies believe he won with an assist from President Vladimir V. Putin of Russia.
Then Mr. Trump will have to say whether he accepts the agencies’ basic findings on Russia’s role or holds to his previous contention that inept, politicized American spies have gotten the perpetrator of the hacking wrong. That would throw the intelligence agencies into a crisis of credibility and status with few, if any, precedents.
In a pair of Twitter posts early Thursday, Mr. Trump appeared to back away from the scorn he had previously expressed for the intelligence agencies’ work, as well as from his embrace of Julian Assange, the founder of WikiLeaks, which released most of the hacked emails of Democratic officials.