Neal Katyal, who served as acting U.S. Solicitor General under former President Obama from 2010 to 2011, called President TrumpDonald John TrumpTrump says he doesn't want NYT in the White House Veterans group backs lawsuits to halt Trump's use of military funding for border wall Schiff punches back after GOP censure resolution fails MORE’s retweet of a conspiracy theory tying former President Clinton to the death of alleged sex trafficker Jeffrey Epstein “unfathomable.”

“It is unfathomable to me that a President of the United States would retweet this. Literally unfathomable,” Katyal tweeted Saturday evening.

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“It would be outrageous for even a member of a local city council, let alone from the person who is to Take Care that the Laws be Faithfully Executed,” he added.

The tweet in question cited no evidence. Clinton’s name appears several times on flight logs for Epstein’s private jet, while Epstein and Trump were known to move in the same circles in New York and Florida and Trump told New York Magazine that Epstein was a “terrific guy” in 2002 but later fell out with the financier.

Counselor to the president Kellyanne ConwayKellyanne Elizabeth ConwayTrump embarks on Twitter spree amid impeachment inquiry, Syria outrage The Hill's Campaign Report: Biden camp faces new challenges Trump offers condolences on frequent foe Cummings: 'Very hard, if not impossible, to replace' MORE defended Trump’s retweet on “Fox News Sunday,” saying “I think the president just wants everything to be investigated.”

Several 2020 Democratic candidates blasted Trump for spreading the conspiracy theory Sunday morning, including Sen. Cory BookerCory Anthony BookerPoll: Biden holds 10-point lead nationally over Warren Trump declines to participate in Weather Channel 2020 climate change special Bennet: Warren 'not being honest about' her 'Medicare for All' plan MORE (D-N.J.) and former Rep. Beto O’Rourke (D-Texas), as did CNN’s Jake TapperJacob (Jake) Paul TapperRomney earns rants and raves for secret Twitter name CNN hires former GOP Rep. Sean Duffy Biden praises Buttigieg for criticizing GOP attacks: 'That's a good man' MORE, who said Trump could "use his megaphone for anything” but “often uses it to amplify that which is the worst of us: personal attacks, bigotry and insane conspiracy theories.”