Former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE said Friday that 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 likely already has a case for obstruction of justice against President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE, and is waiting to bring the case before a grand jury.

In an interview on HBO's "Real Time with Bill Maher," Holder expressed faith that the sprawling Mueller probe would result in more charges.

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"Well I think that you technically have an obstruction of justice case that already exists," Holder said. "I've known Bob Mueller for 20, 30 years. My guess is, he's just trying to make the case as good as he possibly can."

During his appearance on the show, Holder also defended calls from Democratic mega-donor Tom Steyer to make Trump's supposed dereliction of duty on confronting Russia over election meddling a campaign issue.

"But I think that Steyer is absolutely right in the sense that Trump is derelict in his duties," Holder said. "We were attacked. It wasn't a physical attack, it was an electronic attack, on our most vital of systems, and he's done nothing to prepare us for what is to come. Because they're still coming."

"And he's done nothing to hold the Russians accountable in spite of the fact that this dysfunctional Congress passed sanctions that he has refused to implement," Holder continued.

"And that for me is breathtaking, unforgivable and ultimately something the American people have to hold him responsible for."

Mueller's probe expanded last month with the indictment of 13 Russian nationals for alleged efforts to interfere in the 2016 election by using fake social media profiles to spread disinformation and divisive rhetoric among Americans.

Holder, who served as attorney general under former President Obama, warned Trump in December that he could face mass protests if he chooses to shut down the Mueller probe.

"ABSOLUTE RED LINE: the firing of Bob Mueller or crippling the special counsel's office. If removed or meaningfully tampered with, there must be mass, popular, peaceful support of both," Holder tweeted in December.