Chris Matthews: Trump Jr., Ivanka ‘stand as the next dominoes to fall’

MSNBC host Chris Matthews said Monday that 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 and Ivanka TrumpIvana (Ivanka) Marie TrumpThe Hill's 12:30 Report: Trump stokes fears over November election outcome Special counsel investigating DeVos for potential Hatch Act violation: report Trump, Biden vie for Minnesota MORE could be "the next dominoes to fall" in special counsel Robert MuellerRobert (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 ongoing investigation.

"The president’s children stand right in the line of Mueller’s investigative progress," Matthews said on "Hardball." "They stand as the next dominoes to fall."

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"Therein lies the problem, where earlier Mueller subjects have given [President] Trump up, these two lack the option to do that. They can hardly testify against their father," he continued. "If the prosecutor will not be stopped and the kids will not fall to him, we see the president’s adult children heading to prison."

Matthews suggested that Mueller could strike a deal where Ivanka Trump and Donald Trump Jr. could walk if President TrumpDonald 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 does the same.

"But what if the prosecutor were to offer the president an alternative?" he said. "What if he were to say he would let the children walk if the old man does the same? That would mean giving up the presidency in exchange for acquittals all around ― not just for himself, but for all his kids.”

Mueller's investigation into Russian election interference and any possible collusion with the Trump campaign has led to criminal indictments against 33 individuals and three entities.

President Trump has repeatedly denounced the probe, often labeling it a “witch hunt.”