Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.) bashed President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Tuesday for his criticism of Lt. Col. Alexander Vindman Alexander VindmanImpeachment witness Alexander Vindman calls Trump Putin's 'useful idiot' The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Strzok: Trump behaving like an authoritarian MORE, calling out the president as “a disgrace” for his attacks on the National Security Council (NSC) official currently giving testimony in House Democrats' impeachment inquiry.

The 2020 presidential candidate criticized Trump on Twitter, saying, “You are attacking a decorated Army colonel.”

You are attacking a decorated Army colonel.



Alexander Vindman served in the Iraq War. You serve yourself.



He received a Purple Heart. You're receiving subpoenas.



Unlike you, he has a sense of duty to this country. He is a patriot. You are a disgrace. https://t.co/JnIwDAyh9o — Kamala Harris (@KamalaHarris) October 29, 2019

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Trump

Tuesday morning, condemning the Democrats for their handling of the impeachment inquiry and seeking to cast doubt on the credibility of Vindman, the top NSC official for European affairs.

Trump again insisted there was nothing wrong with his July 25 phone call with Volodymyr Zelensky, in which he pressed the Ukrainian president for an investigation into one of his 2020 rivals. Trump's push for a Kiev probe into former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and his son, Hunter Biden, came days after he delayed hundreds of millions of dollars in U.S. aid to Ukraine that had been approved by Congress.

Supposedly, according to the Corrupt Media, the Ukraine call “concerned” today’s Never Trumper witness. 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! — Donald J. Trump (@realDonaldTrump) October 29, 2019

Vindman indicated in his opening statement that he reported the Trump administration’s interactions with Ukraine twice to his superiors, but he said he is not the whistleblower whose report on the July 25 phone call pushed Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) to launch the impeachment inquiry.

House Democrats have faced criticism for holding these initial hearings behind closed doors, but they have announced they plan to hold the first public floor vote on the inquiry Thursday.