WASHINGTON -- Facing growing accusations of racism for his incendiary tweets, U.S. President Donald Trump lashed out at his critics Monday and sought to deflect the criticism by labeling a leading black congressman as himself racist.

In the latest rhetorical shot at lawmakers of colour, Trump said his weekend comments referring to Rep. Elijah Cummings' majority-black Baltimore district as a "disgusting, rat and rodent infested mess" where "no human being would want to live" were not racist. Instead, "if racist Elijah Cummings would focus more of his energy on helping the good people of his district, and Baltimore itself, perhaps progress could be made in fixing the mess."

"His radical 'oversight' is a joke!" Trump tweeted Sunday.

After a weekend of attacks on Cummings, the son of former sharecroppers who rose to become the powerful chairman of the House Oversight and Reform Committee, Trump expanded his attacks Monday to include a prominent Cummings defender, the Rev. Al Sharpton, who held a press conference in Baltimore to condemn the president.

"Al is a con man, a troublemaker, always looking for a score," adding that the civil rights activist and MSNBC host "Hates Whites & Cops!"

, saying, "I do make trouble for bigots."

claiming that "Billions of dollars have been pumped in" to the city.

"The money was stolen or wasted," Trump tweeted. "Ask Elijah Cummings where it went. He should investigate himself with his Oversight Committee!"

Earlier Monday, Trump convened a group of "wonderful Inner City Pastors" for an unannounced closed-door meeting to discuss the issues facing the black community Monday.

"This country needs healing. There's so much division in America along racial lines," said Bill Owens, president of the Coalition of African American Pastors, who said he was among about 20 pastors who had met with the president.

"He wanted to know from us: What should he do in America? What best can he do?" Owens said of Trump, insisting the gathering "was not damage control."

Asked by a reporter whether he thought Trump was racist, Owens said he found that "hard to believe," but said the president could do more to address racism in the country, "absolutely."

Alveda King, the niece of civil rights leader Martin Luther King Jr. and a longtime Trump supporter, also noted Trump's longtime relationships with Sharpton and civil rights activist Jesse Jackson.

"These are his brothers," King said.

Trump appeared to dig a deeper hole even as a top White House aide sought to dismiss the controversy by describing Trump's comments as hyperbole. Two weeks ago, Trump caused a nationwide uproar with racist tweets directed at four Democratic congresswomen of colour as he looked to stoke racial divisions for political gain heading into the 2020 election.

Trump noted that Democratic presidential contender and Vermont Sen. Bernie Sanders had "recently equated" parts of Baltimore to a "third world country" in 2015 comments.

"I assume that Bernie must now be labeled a Racist, just as a Republican would if he used that term and standard,"

that "Trump's lies and racism never end. While I have been fighting to lift the people of Baltimore and elsewhere out of poverty with good paying jobs, housing and health care, he has been attacking workers and the poor."

Maryland Gov. Larry Hogan, a Republican, on Monday called the president's comments "just outrageous and inappropriate." Hogan, the new chairman of the National Governors Association, said he recently gave an address at the NGA about the angry and divisive politics that "are literally tearing America apart."

"I think enough is enough," Hogan said on the C4 Radio Show in Baltimore. "I mean, people are just completely fed up with this kind of nonsense, and why are we not focused on solving the problems and getting to work instead of who's tweeting what, and who's calling who what kind of names. I mean, it's just absurd."

Michael Steele, the state's former lieutenant governor who went on to serve as the national chairman of the Republican National Committee, said it was "reprehensible to talk about the city the way" Trump did, but he hoped the attention would elevate the conversation about how to help urban areas, and he invited the president to be a part of the conversation.

"Put down the cellphone and the tweeting and come walk the streets in this community so that you can see firsthand the good and the difficult that needs to be addressed, and let's do it together," Steele told the radio show.

Speaking in television interviews on Sunday, acting chief of staff Mick Mulvaney said Trump was reacting in frustration to the Democrats' unrelenting investigations and talk of impeachment. He said Trump swung hard at Cummings and his Baltimore district because he believes such Capitol Hill critics are neglecting serious problems back home in their zeal to unfairly undermine his presidency.

"I understand that everything that Donald Trump says is offensive to some people," Mulvaney said. But he added, "The president is pushing back against what he sees as wrong. It's how he's done it in the past, and he'll continue to do it in the future."

The president has tried to put racial polarization at the centre of his appeal to his base of voters, tapping into anxieties about demographic and cultural changes.

Cummings is leading multiple investigations of the president's governmental dealings. In his direct response to Trump on Twitter, Cummings said: "Mr. President, I go home to my district daily. Each morning, I wake up, and I go and fight for my neighbours. It is my constitutional duty to conduct oversight of the Executive Branch. But, it is my moral duty to fight for my constituents."

Cummings has also drawn the president's ire for investigations touching on his family members serving in the White House. His committee voted along party lines Thursday to authorize subpoenas for personal emails and texts used for official business by top White House aides, including Ivanka Trump and her husband, Jared Kushner.

Earlier this month, Trump drew bipartisan condemnation following his call for Democratic Reps. Ilhan Omar of Minnesota, Alexandria Ocasio-Cortez of New York, Ayanna Pressley of Massachusetts and Rashida Tlaib of Michigan to get out of the U.S. "right now." He said that if the lawmakers "hate our country," they can go back to their "broken and crime-infested" countries.

All four lawmakers of colour are American citizens. Three of the four were born in the U.S.

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Associated Press writers Jill Colvin and Brian Witte in Annapolis, Maryland, contributed to this report.