Rep. Jim Himes James (Jim) Andres HimesMany Democrats want John Bolton's testimony, but Pelosi stays mum SEC's Clayton demurs on firing of Manhattan US attorney he would replace Democrats face tough questions with Bolton MORE (D-Conn.), a top Democrat on the House Intelligence Committee, said Sunday that Democrats’ case against 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 would not necessarily collapse if 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 testifies this week that there was no quid pro quo in the release of military aid to Ukraine.

“Doesn’t your case essentially depend on Sondland? If he doesn’t say that the president set this condition, this quid pro quo, doesn’t that blow a hole in your case?” Fox News’ Chris Wallace Christopher (Chris) WallaceHouse to vote on resolution affirming peaceful transition of power Gayle King calls out Pelosi for calling Trump supporters 'henchmen': 'Egregious language' GOP lawmakers distance themselves from Trump comments on transfer of power MORE asked Himes on “Fox News Sunday.”

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“I don’t think it blows a hole in the case… there is ample evidence that there was a corrupt deal being cooked up,” Himes responded, citing former National Security Advisor John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE’s reported reference to the arrangement as a “drug deal.”

“We know what [Sondland] has already said in his revised testimony where he revised his recollection,” Himes added, also citing the closed-door deposition 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, who is scheduled to deliver public testimony this week.

Moreover, Himes said, “The president, who frequently says ‘I’m the most transparent guy out there’ is not letting, is refusing to permit, other people like his chief of staff, to come testify… he is refusing to permit emails and phone calls and other documents that might actually shed some light on this to come forward.”

Wallace suggested to Himes that if House Democrats don’t have any witnesses “who can take us into the Oval Office, it seems to me that creates a big problem,” and asked if Sondland could be considered a credible witness after already revising his testimony.

“That’s a good question,” Himes responded, but said “it was not lost on Ambassador Sondland what happened to the president’s close associate Roger Stone Roger Jason StoneFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. The agony of justice Our Constitution is under attack by Attorney General William Barr MORE for lying to Congress [so] my guess is Ambassador Sondland is going to do his level best to tell the truth.”

Stone was convicted on seven counts, including witness tampering and making false statements, on Friday.