Intelligence panel Democrat: It appears Sondland committed perjury

Rep. Joaquin CastroJoaquin CastroWarren campaign hires two top Castro staffers Democrats press Trump administration to stop DNA collection from detained migrants The Hill's Morning Report - Trump trial begins with clash over rules MORE (D-Texas), a member of the House Intelligence Committee, said late Monday that he believes U.S. Ambassador to the European Union Gordon SondlandGordon SondlandSenate rejects subpoenaing Mulvaney to testify in impeachment trial The Memo: Day One shows conflicting narratives on impeachment GOP rejects effort to compel documents on delayed Ukraine aid 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.

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 TrumpDonald John TrumpRouhani says Iran will never seek nuclear weapons Trump downplays seriousness of injuries in Iran attack after US soldiers treated for concussions Trump says Bloomberg is 'wasting his money' on 2020 campaign 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 BidenJoe BidenSanders joins Biden atop 2020 Democratic field: poll The Hill's Morning Report - Trump trial begins with clashes, concessions Trump says impeachment lawyers were 'really good' 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.