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.) on Sunday said Republicans would be wasting their time by asking 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 about FBI misconduct.

“Very clear the Trump investigation was not predicated on the so-called dossier, there was nothing wrong with the FISA application, all the things that they’re talking about have been gone through," Nadler said on "Fox News Sunday."

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“If they want to debate or discuss this irrelevancy, let them waste their time. What’s before the American people is the conduct of this president."

Nadler's remarks came after Chris Wallace Christopher (Chris) WallaceGOP lawmakers distance themselves from Trump comments on transfer of power Trump mocks Biden for calling 'a lid' before 9 a.m. Trump claims Fox anchor Chris Wallace won't ask Biden 'tough questions' at debate MORE asked him whether there was a chance Republicans could benefit more from Mueller's testimony than Democrats, given that the former special counsel has promised not to go beyond information presented in his report.

Mueller is set to appear Wednesday before the House Judiciary and Intelligence Committees to testify about his two-year probe into Russian interference in the 2016 election and possible obstruction of justice by the president in subsequent investigations.

Republicans have long criticized the FBI’s alleged use of information from the controversial Steele dossier in an application to surveil onetime Trump campaign adviser Carter Page.

The Department of Justice inspector general is said to have nearly completed his own review of the FBI’s actions in applying for the warrant.

The former special counsel found insufficient evidence to bring charges against Trump or his campaign over conspiring with Moscow during the 2016 presidential election, but declined to clear the president of obstruction of justice, outlining 10 “episodes” of possibly obstructive behavior but saying existing DOJ guidelines against indicting a sitting president prevented him from bringing charges.

Mueller has affirmed he would not discuss anything outside of the purview of his report during the hearing, though Democrats are eager for the opportunity for a national audience to hear some of the more powerful details.