"They are laughing their asses off in Moscow", Trump tweeted on Sunday morning.
When on Friday Robert Mueller, the special counsel investigating Russian interference in the USA elections of 2016, published reams of evidence of just that, the president interpreted it as an attempt on his own probity and legitimacy. He then suggested Schiff, who is the ranking Democrat on the House Intelligence Committee, was investigating Russian collusion because Democratic presidential nominee Hillary Clinton lost to Trump.
Later, he wrote that Russians "are laughing their asses off in Moscow" because they had "succeeded beyond their wildest dreams" in sowing discord in the U.S.
The president also insisted in a tweet Sunday that he "never said Russian Federation did not meddle in the election" at all, adding, "I said 'it may be Russian Federation, or China or another country or group, or it may be a 400 pound genius sitting in bed and playing with his computer'".
Vice President Mike Pence, speaking last week in Washington, misstated USA intelligence conclusions about the election hacking, arguing "it is the universal conclusion of our intelligence communities that none of those efforts had any effect on the outcome of the 2016 election".
Republican Senator Chuck Grassley, who's been critical of how the Russia probe was conducted, tweeted at the president Sunday to say "we can no longer say there is no Russian interference in our elections since Mueller indictments".
THE FACTS: On multiple occasions Trump has challenged the veracity of the mounting evidence about Russian interference in the 2016 campaign. Kislyak's name has come up in the FBI and congressional investigations of possible collusion between the Trump campaign and Russian Federation.
Whether there was any collusion with Russian Federation is still part of Mueller's investigation.
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In a subsequent panel at the conference, Sergei Kislyak, who served as Russian ambassador to Washington at the time of the alleged election meddling, denied that he or his staff had carried out any such activities during his time there.
Trump has faced criticism since the indictments were unveiled for failing to address the seriousness of the allegations or how the USA would defends itself from further attempts at electoral subversion by foreign powers, and instead focussing on claims that the indictments do not personally implicate him.
"Every time he sees me, he says, 'I didn't do that, ' " Trump said.
"Oh my god. 17 OF MY CLASSMATES AND FRIENDS ARE GONE AND YOU HAVE THE AUDACITY TO MAKE THIS ABOUT RUSSIA???!" He did not mention that the administration has yet to impose those sanctions, saying the threat of them alone has begun to change Russian behavior.
McMaster said in remarks the previous evening that the indictment provides "really incontrovertible" evidence of Russian malfeasance in the election.
The special counsel's indictment also spells out how operatives used Facebook groups to coordinate events supporting both Trump and Democratic opponent Hillary Clinton.
Social media companies, especially Facebook Inc and Twitter Inc, have been under heavy pressure to find ways of stopping what is often referred to as "information warfare" on their services.
The email continued: "I created all these pictures and posts, and the Americans believed that it was written by their people".