"At this point, we're being manipulated by the Russians at very little cost to them. Things pop up, and we go into a frenzy," Thomas Graham of Kissinger Associates tells NPR in a rare interview.
A spokeswoman for Russia's foreign ministry announced the extension on Facebook, while ridiculing a former deputy CIA chief. Snowden is in exile in Russia; his supporters have called for a pardon.
The Georgia Democratic congressman said in an interview Friday he didn't view Trump as a "legitimate president" amid reports that Russian cyberattacks had intended to influence the elections.
Critics have long raised concerns about Gen. Michael Flynn's relationship with Moscow. The nominee for national security adviser was in regular contact in December with Russia's ambassador to the U.S.
The dossier lists unverified allegations about Donald Trump, claiming Russia has evidence as blackmail material. News outlets have identified former MI6 officer Christopher Steele as the author.
In his first news conference since last summer, he denied unverified reports that Russia has compromising intelligence on him and outlined how he'd try to unwind his complex businesses as president.
The Kremlin denied that it collects political dirt, known as kompromat. But disinformation, fake photos and leaked sex tapes have long been features of Russian politics.
Intelligence officials recently briefed both Obama and Trump about the unconfirmed reports. U.S. intelligence agencies have said Russia engaged in an extensive hacking effort during the 2016 election.