Intelligence panel Democrat: It appears Sondland committed perjury

Rep. Joaquin CastroJoaquin CastroDemocrats face make-or-break moment on impeachment Speier: Hearing transcripts will likely be released in next five days Sondland emerges as key target after Vindman testimony 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 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 TrumpTrump faces high stakes in meeting with Erdoğan amid impeachment drama Democrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report 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 BidenDemocrats worry they don't have right candidate to beat Trump Trump threatening to fire Mulvaney: report Giuliani pens op-ed slamming 'unprecedented' impeachment inquiry 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.