Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) said Sunday that 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 has to decide if his loyalty is to the country or to President Trump as the U.S. ambassador to the European Union prepares to testify publicly on Wednesday as part of the ongoing impeachment inquiry.

CNN's "State of the Union" host Jake Tapper Jacob (Jake) Paul TapperThe media's misleading use of COVID-19 data Julia Louis-Dreyfus: 'We can't spend much time grieving' Ginsburg Pence aide dismisses concerns rushed vote on Trump nominee will hurt vulnerable senators MORE asked Murphy if Democrats can trust Sondland as a "credible witness," after the ambassador revised testimony given behind closed doors earlier this month.

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"Gordon Sondland clearly didn't tell the truth in his initial testimony, I don't know why he decided to ultimately come clean," Murphy responded.

"But he did so, and I think over the weekend Sondland has to decide whether his primary loyalty is to America or to the president of the United States."

In his revised testimony, Sondland said he told a top Ukrainian official that that U.S. aid would likely not occur until Ukraine announced public investigations that Trump had been requesting.

The alleged quid pro quo deal is at the heart of the Democrats' impeachment inquiry into Trump.

A top aide at the National Security Council, Tim Morrison, testified last month that Sondland pushed Ukraine – on behalf of Trump – to launch two investigations that could help the president politically.

According to testimony released on Saturday, Morrison said Sondland relayed to a top Ukrainian representative that the release of U.S. military aid to Kyiv hinged on the investigations Trump sought.