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 Tuesday responded to 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 shortly after House Democrats formally launched an impeachment inquiry against him, telling Trump that "it's not about the transcript of a call."

After House Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight 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 MORE (D-Calif.) announced the launch of an impeachment inquiry, Trump tweeted his dismay, writing, “They never even saw the transcript of the call. A total Witch Hunt.”

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Amash, a frequent and outspoken Trump critic who left the GOP on July 4, quickly fired back.

“Don’t let President Trump or Republican officials distract you with a straw man,” Amash tweeted. “It’s about his continuing abuse of the office of the presidency.”

It’s not about the transcript of a call. Don’t let President Trump or Republican officials distract you with a straw man. It’s about his continuing abuse of the office of the presidency. https://t.co/j044TpHFvr — Justin Amash (@justinamash) September 24, 2019

The latest back-and-forth between Trump and one of his staunchest conservative critics comes amid mounting scrutiny over reports of the president’s call with Ukrainian President Volodymyr Zelensky in which Trump reportedly pressured him to investigate 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 and his son Hunter Biden over allegations of corruption.

The allegations prompted a flood of House Democrats to back opening an impeachment inquiry into Trump.

Trump said Tuesday he had authorized a transcript of the call with Zelensky to be released. He also said he would release the whistleblower’s complaint that started the ordeal to Congress.

Amash previously called for impeaching Trump on the grounds that the president obstructed justice in his attempts to impede former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s investigation into Russia's election interference in 2016.

Amash was the first and only Republican lawmaker to call for impeaching Trump, prompting a feud with Trump and Amash’s eventual exit from the party.