National Security Council (NSC) official Lt. Col. Alexander Vindman, who testified before the House this week as part of the impeachment inquiry, has reportedly said that he was told not to talk about 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's call with the president of Ukraine after he raised concerns about it.

Politico reported Friday that Vindman testified that White House lawyer John Eisenberg told him not to tell anyone about the call because it was Vindman's job to coordinate interagency procedures regarding it.

The Washington Post previously reported that Vindman had testified that Eisenberg was behind the decision to move the call to a classified server and that Vindman had raised concerns about the call.

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Vindman offered testimony this week about his concerns over the call, saying he did not think it was appropriate for the president to pressure a foreign country's leader to investigate a U.S. citizen — former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE, a Democratic presidential candidate.

Vindman also expressed worries that Trump's actions would impair bipartisan support for Ukraine.

Revelations that Trump encouraged Ukrainian President Volodmyr Zelensky to look into Biden during the July call are at the center of the House impeachment inquiry. Trump has denied wrongdoing and has maintained that there was not a quid pro quo involving his requests for the investigation and military aide that was initially withheld from Ukraine.

The president has also attacked Vindman as a "Never Trumper" following his testimony.

“Supposedly, according to the Corrupt Media, the Ukraine call ‘concerned’ today’s Never Trumper witness,” Trump tweeted. “Was he on the same call that I was? Can’t be possible! Please ask him to read the Transcript of the call. Witch Hunt!”

Neither the NSC nor Eisenberg returned Politico's requests for comment. The Hill has also reached out to the NSC and the White House.