President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE said Monday that Sen. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.) should focus "on her heritage" rather than investigating his businesses.

"I got one [letter] from Pocahontas today where it said that 'Donald Trump, we want to investigate some company,' it's so disgraceful," Trump told Fox News host Laura Ingraham, referring to Warren as Pocahontas, a name he has frequently used to insult her claims of Native American heritage. It is not clear what investigation he referenced.

"I said just write her back and say she's got a conflict of interest, OK?" he continued. "She should focus more on her heritage and not being ashamed of what she is."

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Warren, who officially announced her bid for president last weekend, publicly apologized for previously identifying as Native American last week.

The comments about Warren came in the midst of a discussion with Ingraham where Trump called investigations into his businesses and potential collusion with Russia a hoax.

"What happened to me should never be allowed to happen to another president, with investigations on things that never took place, like Russia. The Russia collusion delusion, we call it. I call it a hoax," he said.

"The Democrats know it's a hoax. It's a political game. Now the Russia thing is dead and they say well, we are going to look at every company that Donald Trump was ever ... involved in. I did great. I made a lot of money. Now they want to go back and investigate every company. We have I think 79 different letters from different committees."

A Senate committee and 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 are both separately investigating potential ties between the Trump campaign and Russia. Trump has denied any collusion.