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

MSNBC host Chris Matthews said Monday that Donald Trump Jr.Donald (Don) John TrumpWhite House calls Democratic witness's mentioning of president's youngest son 'classless' Lawmakers to watch during Wednesday's impeachment hearing Top Democrats knock Trump on World AIDS Day MORE and Ivanka TrumpIvana (Ivanka) Marie TrumpWhite House, Congress near deal to give 12 weeks paid parental leave to all federal workers Lawmakers introduce bipartisan bill to allow new parents to advance tax credits Jane Fonda says she feels 'sad' for Trump MORE could be "the next dominoes to fall" in special counsel Robert MuellerRobert (Bob) Swan MuellerTrump says he'll release financial records before election, knocks Dems' efforts House impeachment hearings: The witch hunt continues Speier says impeachment inquiry shows 'very strong case of bribery' by Trump 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 TrumpTrump says he will 'temporarily hold off' on declaring Mexican drug cartels as terror organization House Judiciary Committee formally receives impeachment report Artist behind gold toilet offered to Trump sells banana duct-taped to a wall for 0,000 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.”