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 TrumpTrump campaign selling branded plastic straws as alternative to 'liberal paper straws' The Hill's Morning Report — Trump retreats on census citizenship question Trump set to host controversial social media summit MORE and Ivanka TrumpIvana (Ivanka) Marie TrumpTrump steps up attacks on 'Squad' after post-rally furor Trump says he doesn't care if attacks on 'Squad' hurt him politically EXCLUSIVE: Career officials rebut claims of White House interference in security clearance process MORE could be "the next dominoes to fall" in special counsel Robert MuellerRobert (Bob) Swan MuellerTop Republican considered Mueller subpoena to box in Democrats Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate 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 TrumpLiz Cheney: 'Send her back' chant 'inappropriate' but not about race, gender Booker: Trump is 'worse than a racist' Top Democrat insists country hasn't moved on from Mueller 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.”