Educating the American public on what is in the Mueller report is a priority for Democrats, who believe Trump and his allies have created the public impression that the report said there was no obstruction of justice.
In a preview of his testimony, Dean said in an interview with CNN that Trump's misdeeds are "strikingly like Watergate".
'If important information is held back, then we will have no choice but to enforce our subpoena in court and consider other remedies.
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With Trump pledging that "we're fighting all the subpoenas, " Democratic leaders want to avoid repeated floor votes on contempt resolutions that detract from their legislative agenda.
The Mueller report plainly stated that the special counsel found evidence of presidential-level obstruction: Trump tried on multiple occasions and through multiple aides to hinder, limit and even end the probe. It concluded there was no conspiracy between the Trump campaign and Moscow. The Trump administration's blockade of the material had ground the Democratic investigations of Mr. Trump's possible obstruction of justice and abuse of power to a halt.
Upon releasing the redacted Mueller report, Barr offered a handful of lawmakers, including Nadler, a chance to view a minimally redacted version of the report.
President Trump blasted Dean as a "CNN sleazebag attorney" Sunday in a nod to Dean's appearances on the cable news channel.
House Judiciary Committee Chairman Jerrold Nadler said he will hold off on a threat to bring criminal contempt charges against Attorney General William Barr, as long as the Justice Department continues to provide materials sought by his committee. In response, the Judiciary Committee voted to hold Barr in contempt.
Monday's hearing is the start of three days of Russia-related action on Capitol Hill.
Gaetz opened his aggressive questioning by pointing out that Dean has compared both Trump and former President George W. Bush to Nixon.
"In light of today's agreement from the Justice Department, it's logical to ask: Is the chairman prepared to rescind his baseless recommendation to hold the attorney general in contempt, or do House Democrats still plan to green light lawsuits against the attorney general and former White House counsel tomorrow?"