President Trump’s oldest son on Wednesday wrote on Twitter the name of the alleged whistleblower whose anonymous complaint prompted the impeachment inquiry against the president.

“Because of course he did!!! Alleged ‘Whistleblower’ Eric Ciaramella Worked Closely with Anti-Trump Dossier Hoaxer,” Trump Jr. wrote, linking to an article from Breitbart News.

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“Eric Ciaramella, whom Real Clear Investigations suggests is the likely so-called whistleblower, was part of an Obama administration email chain celebrating the eventual signing of a $1 billion U.S. loan guarantee to Ukraine,” the article says.

“That and other emails show Ciaramella interfaced about Ukraine with individuals who played key roles in facilitating the infamous anti-Trump dossier produced by Fusion GPS and reportedly financed by Hillary Clinton’s presidential campaign and the Democratic National Committee. One of those individuals, then-Assistant Secretary of State for European Affairs Victoria Nuland (pictured), received updates on Ukraine issues from dossier author Christopher Steele in addition to Nuland’s direct role in the dossier controversy.”

Ciaramella’s name comes up in six Obama-era government emails that were released by the State Department as part of two previous Freedom of Information Act requests. At the time of the exchanges, Ciaramella served as the Director for Baltic and Eastern European Affairs for the Obama-era National Security Council, where he worked on Ukraine policy. He is now an analyst at the Central Intelligence Agency.

President Trump has alleged that the so-called whistleblower may not exist. “There is no Whistleblower. There is someone with an agenda against Donald Trump,” the president tweeted on Monday.

Sen. Rand Paul (R-KY) in recent days has threatened to name the whistleblower and is demanding they testify in Congress.

“We also now know the name of the whistleblower… I say tonight to the media, do your job and print his name,” Rand said.