House Republicans promise tough questions at Mueller hearing

"Remember, the Mueller report is a one-sided report," Collins said. "It has not been questioned from the other side. This is our chance to do that."

Days before back-to-back hearings Wednesday, both sides seemed to agree that Mueller's testimony could be pivotal in shifting public opinion on the question of "holding the president accountable."

"This is a president who has violated the law 6 ways from Sunday," said New York Rep. Jerrold Nadler, chairman of the Judiciary Committee. He argued that Mueller's report lays out "very substantial evidence" that Trump is guilty of "high crimes and misdemeanors," the constitutional standard for impeachment.

"We have to present — or let Mueller present — those facts to the American people ... because the administration must be held accountable and no president can be above the law," Nadler said.

The House Judiciary Committee and the House Intelligence Committee will question Mueller in separate hearings on the report. While the report did not find sufficient evidence to establish charges of criminal conspiracy between the Trump campaign and Russia to swing the election, it said Trump could not be cleared of trying to obstruct the investigation . But Mueller believed Trump couldn't be indicted in part because of a Justice Department opinion against prosecuting a sitting president.

Mueller has said he doesn't intend to speak beyond the findings of the report in congressional hearings.

Still, Democrats on the Judiciary Committee plan to focus on a narrow set of episodes laid out in the report to direct Americans' attention to what they see as the most egregious examples of Trump's conduct, which point to obstruction of justice.

The examples include Trump's directions to then-White House counsel Donald McGahn to have Mueller removed and, later, orders from Trump to McGahn to deny that happened. Democrats also will focus questioning on a series of meetings Trump had with former campaign manager Corey Lewandowski in which the Republican president directed Lewandowski to persuade then-Attorney General Jeff Sessions to limit Mueller's investigation.

Collins, meanwhile, said Republicans will focus in part on the origins of the Russia investigation, which Trump has long derided as a political "witch hunt" as well as evidence they see of potential bias in the FBI's handling of the probe.

"There's going to be a lot of questions for what he did say, what he didn't say, and how this thing started," he said, referring to Mueller. "This is the time that the Democrats have got to show on their end how much time they have been wasting of our committee and how we have not been getting things done because they simply don't like this president, who was elected by the people in 2016, and they're just trying to derail him for 2020."

Mueller's appearance comes more than two years since the start of the Russia investigation, an extraordinary moment in Trump's presidency when, after Trump had fired FBI Director James Comey, his Justice Department appointed Mueller to take over the inquiry into election interference and the potential role that Trump and his winning 2016 campaign may have played.

While Mueller's testimony was once envisioned as a crystalizing event, a Watergate-style moment to uncover truths, public attention has drifted in the months since the report was released.

"We want Bob Mueller to bring it to life, to talk about what's in that report," said Rep. Adam Schiff, D-Calif., chairman of the House Intelligence Committee. "It's a pretty damning set of facts that involve a presidential campaign in a close race welcoming help from a hostile foreign power, not reporting it but eagerly embracing it, building it into their campaign strategy, lying about it to cover up, then obstructing an investigation into foreign interference again to try to cover up."

Intelligence committee aides have said they believe the public has received a slanted view of what Mueller found on the question of criminal conspiracy because of Trump's repeated claims of "no collusion," and because the details of Russia's interference in the election — and the outreach to the Trump campaign — haven't gotten enough attention.

"Who better to bring them to life than the man who did the investigation himself?" Schiff asked.

Nadler said he's not worried that Republicans might seek to attack the credibility of the Russia investigation and says he hopes to take cues from the public after the hearing about "where we go from here."

"We hope it won't end up being a dud," he said.

Nadler spoke on "Fox News Sunday," Schiff appeared on CBS' "Face the Nation" and Collins was on Fox News Channel's "Sunday Morning Futures."

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Associated Press writer Mary Clare Jalonick contributed to this report.