Rep. Joaquin Castro Joaquin CastroDisinformation, QAnon efforts targeting Latino voters ramp up ahead of presidential election Pompeo accused of stumping for Trump ahead of election Florida Democrat asks FBI to investigate anti-Semitic, racist disinformation MORE (D-Texas), a member of the House Intelligence Committee, said late Monday that he believes U.S. Ambassador to the European Union Gordon Sondland Gordon SondlandGOP chairman vows to protect whistleblowers following Vindman retirement over 'bullying' Top Democrat slams Trump's new EU envoy: Not 'a political donor's part-time job' Trump names new EU envoy, filling post left vacant by impeachment witness Sondland MORE committed perjury in his congressional testimony to investigators in their impeachment inquiry.

“Based on all the testimony so far, I believe that Ambassador Gordon Sondland committed perjury,” Castro tweeted.

Based on all the testimony so far, I believe that Ambassador Gordon Sondland committed perjury. https://t.co/lOGRj8s1yP — Joaquin Castro (@JoaquinCastrotx) October 29, 2019

The tweet came hours before Lt. Col. Alexander Vindman, the highest-ranking Ukraine expert on the National Security Council, is expected to tell lawmakers on Tuesday that he twice reported concerns about 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's tactics in dealing with Ukraine.

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Vindman also wrote in his opening statement that during a meeting between U.S. and Ukraine officials, Sondland — who was present at the meeting — started to talk to Ukraine about “delivering specific investigations” 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, a leading Democratic presidential candidate, and Biden's son in order to secure a meeting with Trump, adding that he told Sondland the statements were “inappropriate.”

But Sondland’s opening statement for his deposition said “nothing was ever raised to me about any concerns regarding our Ukrainian policy.”

Sondland, who has not publicly responded to Vindman’s testimony, appeared on Capitol Hill Monday to review his deposition transcript.

The Hill has requested comment from Sondland's attorney.

Democrats plan to hold a formal vote on impeachment this week.