Rep. Justin Amash Justin AmashRon Paul hospitalized in Texas Internal Democratic poll shows tight race in contest to replace Amash Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (I-Mich.) on Wednesday ripped his former GOP colleagues, telling an elevator full of reporters and Republican lawmakers that allies of 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 are acting as if Americans are "stupid."

Amash reportedly told HuffPost while in a House elevator filled with Republicans that the president's allies in the House "talk about it like we’re all stupid," referring to the impeachment process after 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 testified before the House Intelligence Committee.

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“Sondland testified to a quid pro quo. He testified to significant details and facts. He testified that he thought it was wrong. So the inference is obvious that the president was withholding security assistance," Amash said, referring to the White House's decision to withhold security assistance to Ukraine while the president pushed the country's leader to open a criminal investigation into former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE.

"They talk about it like we’re all stupid, like we can’t see what’s going on," Amash said, adding, "If this were any grand jury proceeding, it would be obvious to everyone."

Amash, who left the Republican Party earlier this year over its support for Trump, has emerged as a vocal supporter of the House impeachment inquiry even as his former colleagues have argued that the process is unfair and an illegitimate attempt to overturn the 2016 election.

Democrats and Amash have argued for months that the president's efforts in Ukraine amounted to an attempt to solicit foreign interference in a U.S. election as well as an abuse of power.