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 triggered a wave of outrage on Tuesday by comparing House Democrats’ ongoing impeachment inquiry to a lynching, drawing rebukes from prominent black lawmakers and a call from at least one Republican to retract the comment.

Trump’s rhetoric on the Democrats' investigation has grown increasingly hostile in recent weeks as he lobs attacks at his political opponents and decries the process as “illegitimate," “bullshit" and a "coup."

But his invocation of a term associated with extrajudicial mob killings of African Americans was particularly incendiary and prompted swift backlash.

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"So some day, if a Democrat becomes President and the Republicans win the House, even by a tiny margin, they can impeach the President, without due process or fairness or any legal rights," Trump tweeted. "All Republicans must remember what they are witnessing here — a lynching. But we will WIN!"

House Majority Whip James Clyburn (D-S.C.) appeared on CNN shortly after the tweet was posted and appeared visibly agitated by Trump’s use of the term.

“I really believe this man is prone to inflammatory statements, and that is one word no president ought to apply to himself,” Clyburn said.

“I’ve studied presidential history quite a bit, and I don’t know if we’ve ever seen anything quite like this,” he continued. “Andrew Johnson never would have described what was happening to him this way, and certainly Bill Clinton William (Bill) Jefferson ClintonHarris: Ginsburg 'absolutely' cleared the path for me Anxious Democrats amp up pressure for vote on COVID-19 aid Barr's Russia investigator has put some focus on Clinton Foundation: report MORE didn’t, nor did Nixon.”

Several other black lawmakers decried Trump invoking lynching in discussing a political process.

Rep. Bobby Rush Bobby Lee RushCongress should investigate OAS actions in Bolivia Rep. Bobby Rush introduces legislation focused on addressing racism, lack of diversity in the federal government House Democrat introduces bill to replace Confederate monuments nationwide MORE (D-Ill.), a civil rights activist who founded a chapter of the Black Panthers in the 1960s, said Trump should delete the tweet.

"You think this impeachment is a LYNCHING? What the hell is wrong with you?" the congressman tweeted. "Do you know how many people who look like me have been lynched, since the inception of this country, by people who look like you. Delete this tweet.”

Rep. Karen Bass Karen Ruth BassOvernight 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 Democrats push to limit transfer of military-grade gear to police Outrage erupts over Breonna Taylor grand jury ruling MORE (D-Calif.), the chairwoman of the Congressional Black Caucus, blasted Trump for “comparing a constitutional process to the PREVALENT and SYSTEMATIC brutal torture of people in THIS COUNTRY that looked like me?"

Rep. Bennie Thompson Bennie Gordon ThompsonUnderwood takes over as chair of House cybersecurity panel House panel pans ICE detention medical care, oversight Senate to hold nomination hearing for Wolf next week MORE (D-Miss.), the top Democrat on the House Homeland Security Committee, decried Trump as “racist and unfit to serve.”

Among Republicans, Rep. Adam Kinzinger Adam Daniel KinzingerFox News reporter defends confirming Atlantic piece despite Trump backlash: 'I feel very confident' GOP lawmaker defends Fox reporter after Trump calls for her firing Lindsey Graham: 'QAnon is bats--- crazy' MORE (R-Ill.), who has been vocally critical of Trump’s moves in Syria, rebuked Trump for using the term and called on him to immediately retract it.

“We can all disagree on the process, and argue merits. But never should we use terms like ‘lynching’ here. The painful scourge in our history has no comparison to politics, and @realDonaldTrump should retract this immediately. May God help us to return to a better way,” Kinzinger tweeted.

White House deputy press secretary Hogan Gidley defended Trump amid the backlash, telling reporters that the president “is not comparing what’s happened to him with one of our darkest moments in American history.”

“What he’s explaining, clearly, is the way he has been treated by the media since he announced for president,” Gidley said, asserting that Trump has been treated unfairly by the media and that Democrats have not offered him due process in their impeachment inquiry.

“People are upset about President Trump’s words all of the time, but what you can’t argue with are the results he has put forth for the African American community,” Gidley said, pointing to progress on criminal justice reform and Trump’s economic policies, which have resulted in record low unemployment among African Americans.

Trump’s tweet likening impeachment to lynching comes one day after he called on Republicans to more vociferously defend him against the impeachment investigation.

"The two things they have: They’re vicious and they stick together," Trump said of Democrats during a Cabinet meeting on Monday. "They don’t have Mitt Romney Willard (Mitt) Mitt RomneyCrenshaw looms large as Democrats look to flip Texas House seat The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE in their midst. They don’t have people like that."

But Trump’s latest remark is likely to make that difficult. While Republicans are largely against impeaching Trump and have presented a unified front on that issue, they have struggled to deal with a wave of self-inflicted controversies caused by the White House in recent weeks.

Many are displeased with Trump’s decision to pull U.S. troops from northern Syria — a decision that effectively paved the way for a Turkish military operation against U.S.-allied Kurds — and pushed back last week on his since-reversed decision to host the Group of Seven (G-7) summit at his Doral resort.

Sen. Lindsey Graham Lindsey Olin GrahamLincoln Project mocks Lindsey Graham's fundraising lag with Sarah McLachlan-themed video The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-S.C.), a staunch Trump ally who has also been critical of the Syria decision, backed Trump for calling impeachment a lynching, telling reporters Tuesday: "This is a lynching in every sense.”

“You can understand why the president’s frustrated,” Rep. Jim Jordan James (Jim) Daniel JordanHouse panel pulls Powell into partisan battles over pandemic Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election House passes resolution condemning anti-Asian discrimination relating to coronavirus MORE (R-Ohio) said when asked if the lynching tweet was appropriate, calling the impeachment inquiry a "ridiculous charade."

Trump also drew criticism from some Democratic presidential candidates on Monday, including former secretary of Housing and Urban Development Julián Castro, who tweeted that it is “beyond shameful to use the word ‘lynching’ to describe being held accountable for your actions.”

Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.), one of two African American presidential candidates, accused Trump of trying to “whitewash” his own corrupt behavior.

“Lynching is a reprehensible stain on this nation's history, as is this President. We'll never erase the pain and trauma of lynching, and to invoke that torture to whitewash your own corruption is disgraceful,” Harris tweeted.

The president’s comments will be particularly difficult for his allies to defend given his history of racially offensive rhetoric.

Trump has criticized black athletes who have protested police brutality and social injustice during the national anthem, suggesting they don’t belong in the country.

He reportedly described Haiti, El Salvador and certain African nations as “shithole countries” and questioned why the U.S. could not take more immigrants from European nations.

Trump caused a firestorm over the summer when he tweeted that four minority congresswomen should “go back” where they came from, despite all four being U.S. citizens and three of them being born here.

Trump’s attacks on Democrats have increased in fervency in the four weeks since 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 lower chamber would move forward with an impeachment inquiry focused on his effort to have Ukraine investigate 2020 Democratic contender and 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.

Trump has lashed out at Pelosi and other Democrats on Twitter and at his campaign rallies, accusing them of trying to bruise him ahead of the 2020 election.

He has singled out specific lawmakers, calling Pelosi “crazy” and “stupid” and suggesting House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.) be investigated for treason.

Alexander Bolton contributed to this report, which was updated at 11:50 a.m.