Sen. Elizabeth Warren Elizabeth WarrenOvernight 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 On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) doubled down on her pledge to not give diplomatic posts to big donors during Wednesday night’s debate.

“I’ve taken a pledge. Anyone who gives a big donation, don’t ask to be an ambassador. I ask everyone running for president to join me in that, and not a single person has so far,” Warren said.

Her answer came in the wake of 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’s bombshell testimony earlier in the day as part of the ongoing impeachment inquiry.

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“How did Ambassador Sondland get there?” Warren asked, adding that his only qualification was writing a “check for a million dollars.”

Warren announced her pledge to not give ambassador posts to wealthy donors in June when she unveiled a plan to improve the State Department.

She said Wednesday that she hopes other 2020 Democratic candidates will join her in the pledge after Sondland's testimony.

Sondland, a Republican megadonor, testified Wednesday that there was a clear quid pro quo in Trump’s interactions with Ukraine. He had previously denied that Trump leveraged a White House meeting and military aid in return for investigations into Trump’s political rivals.