A biographer of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's said Wednesday night that Trump doesn't hold the separation of powers in high regard because he believes in "genetic superiority."

"The president’s father would repeat to him when he was growing up, ‘You're a killer, you're a king.' So this idea of some people being elevated, some people being above all others, in this case above the law, I don’t think is foreign to him," Michael D'Antonio said on "CNN Tonight with Don Lemon." "I think it feels natural. He’s someone who believes in genetic superiority. He told me, 'I don’t respect most people because they’re not worthy of respect.'"

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D'Antonio, a CNN contributor who wrote the book "The Truth About Trump," concluded by asking, "Why would he would respect the separation of powers, checks and balances, any system that is inconvenient for him?"

The comments came as tensions mount between the White House and House Democrats about the administration's defying ongoing congressional investigations.

The administration on Wednesday rejected the House Judiciary Committee's request for documents related to its investigation into whether Trump obstructed justice and committed abuses of power.

The move came about a week after Trump asserted executive privilege over 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 full report.

The White House counsel Pat Cipollone contended that the House panel's investigation amounted to a "do over" of Mueller's probe.

House Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.) said the White House's response was "ridiculous," adding that the move prevented Trump from being held accountable.

Nadler also said Wednesday that Trump's conduct was “making it increasingly difficult” not to impeach him.

“No questions are being answered about any subject. And then, when subpoenas are being issued, there’s a blanket command, disobey all subpoenas. Nobody should testify, and nobody should give documents to Congress,” he said.

Democratic leadership has called for continuing investigations into Trump before coming to a decision regarding impeachment.