Fox News legal analyst Andrew Napolitano Andrew Peter NapolitanoFox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Fox's Napolitano: 2000 election will look like 'child's play' compared to 2020 legal battles Barr asked Rupert Murdoch to 'muzzle' Fox News commentator Napolitano, book claims MORE predicted that former 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 "is certainly going to testify" before the House Judiciary Committee and that Democrats are likely to subpoena him as soon as Thursday afternoon.

“He is certainly going to testify again, whether he wants to or not. He’s a private citizen, they’re probably going to serve him with a subpoena this afternoon,” Napolitano said on "Fox & Friends" Thursday morning.

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His remarks come a day after Mueller spoke publicly for the first time since beginning his now-completed Russia investigation and more than two months after submitting his report to Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE.

Mueller said Wednesday that if his office “had confidence that the president clearly did not commit a crime, we would have said so.”

He also said that Justice Department guidelines prohibited his office from bringing charges against the president, and that the same guidance states “the Constitution requires a process other than the criminal justice system to formally accuse a sitting president of wrongdoing.”

“I think [Barr and Mueller] are going to testify next to each other at the same time. That would be really dramatic,” Napolitano said.

Mueller stated Wednesday he does intend to speak again publicly.

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.) declined to answer questions Wednesday about whether he would subpoena Mueller.

“Mr. Mueller told us a lot of what we need to hear today,” Nadler said. The top Democrat also said “all options are on the table” when asked whether his committee would pursue impeachment proceedings.