Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE is expressing concern about the loyalty of his father's staff following the anonymous New York Times op-ed, saying the number of White House aides 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 can trust is smaller than he would like it to be.

“I think there are people in there that he can trust, it's just — it's a much smaller group than I would like it to be,” Trump Jr. said in an interview aired Tuesday on ABC’s "Good Morning America."

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“I think that’s a shame," he added.

His comments come as the White House continues attempts to undermine the credibility of the anonymous op-ed's author, identified by the Times as a "senior administration official." The author claims they are a part of a network of White House staffers seeking to stave off the president's "worst inclinations."

Trump Jr. told ABC he believes the "pretty disgusting" piece was written by a "low-level person."

"This is very low-level person who will ... basically subvert the vote of the American people who elected my father to do this job,” Trump Jr. said.

Though the president's eldest son is reportedly part of 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 ties between the Trump campaign and Russia, he said during the interview that he is "not worried about it."

"I’m not because I know what I did and I’m not worried about it,” Trump Jr. said.

He also denied reports that he told his father in advance about the controversial Trump Tower meeting with a Russian lawyer.

"[I] testified to that ad nauseam,” Trump Jr. said. “That doesn’t mean they won’t try to do something."

He added the investigation has been "very rough" and "very difficult" for him.

Finally, he issued a warning that Democrats could take back the House during the midterms if "MAGA people" don't "turn out," referring to the president's "Make America Great Again" campaign slogan.