A United Nations expert on freedom of expression said in a new interview that President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE is the “worst perpetrator” of fake news and disinformation.

“In my own country, the United States, the worst perpetrator of false information is the president of the United States,” David Kaye, the U.N. special rapporteur on the promotion and protection of the right to freedom of expression and opinion, told Digital Rights Monitor.

Earlier this month, The Washington Post's fact-checker introduced a “Bottomless Pinocchio” rating to call Trump out on his repeated false claims.

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Kaye, who is also a law professor at the University of California, Irvine, also said that “everybody is struggling” with how to deal with the spread of misinformation and “fake news” from governments and foreign adversaries being spread online.

He added that journalists “need to be covering" fake news and propaganda, but noted that “it’s time consuming; it takes away from other reporting you might do, and when you do it you can come under pressure from the government or other actors.”

He suggested that tech platforms do more to combat disinformation without evaluating content.

“They can’t just zap it and say, ‘This is fake news, it’s off the platform,’ ” Kaye said. “But they can do things like identify how long is this Twitter account that’s tweeting all of this information, how long has it been in effect? Was it created three hours ago? Well then, maybe it should be restricted.”

Facebook, Twitter and other social media platforms have come under fire from both the right and the left about how they handle disinformation.

Trump, who repeatedly refers to unflattering coverage of his administration as “fake news,” has been among the conservative voices criticizing social media platforms for alleged silencing of right-wing accounts, which the tech companies have denied.