Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyCollins says she will vote 'no' on Supreme Court nominee before election The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Gardner signals support for taking up Supreme Court nominee this year MORE (R-Iowa) ripped Democrats on the Judiciary Committee on Wednesday, saying they are unwilling to investigate the Obama administration and Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE.

"If Democrats are unwilling to ask hard questions and force answers from their own political allies, then there simply is no way to move forward together in good faith. Both sides need to be committed to getting the whole story," Grassley said from the Senate floor.

He added that Democrats on the committee, which he oversees, "only want to talk about [President] Trump."

"There is a double standard here in the way that they desperately want to go after the president but ignore all other potential wrongdoing in the previous administration," he said.

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Grassley's comments come as partisan infighting on the panel has increasingly spilled out into the open, with the committee's initially bipartisan investigation largely stonewalled.

Grassley, and some other GOP members on the panel, want to revisit Obama-era scandals, including Clinton's use of a private email server while she was secretary of State and the FBI's investigation into the matter.

Meanwhile, Democrats believe the committee's work should be focused on the Trump era, including potential collusion between the campaign and Moscow, and any obstruction of justice stemming from former FBI Director James Comey's firing.

"[With] Trump-Russia oversight where we have been able to cooperate a great deal there have been similar problems," Grassley said, referencing battles over a controversial research dossier on Trump.

He added, "Democrats are preventing any truly bipartisan path forward."

Grassley's comments come as Democrats on the committee appear increasingly frustrated with him.

Feinstein told CNN on Monday that she had been trying to get Grassley to sign on to her letters requesting further information into Trump campaign actions, but he had not.

"We want him to sign on. I think there's an effort ... not to go deeply," Feinstein told CNN. "I hadn't realized it before. But I realize it now. And we're going to have to find a way to deal with it."

She also told reporters in late October that she and Grassley had agreed to run their own separate probes amid a difference of opinion about what to look into.

But Grassley defended himself on Wednesday night, noting he has worked on oversight committees under administrations of both political parties. "[Democrats] complain publicly and they complain privately that I'm not doing enough to investigate obstruction. But obstruction of justice is a legal term of art. It is a conclusion not evidence. ... I do not make my conclusions first and try to shoehorn the facts to fit my conclusions," he said. He added that the Judiciary Committee has to look for both the FBI's handling of the Clinton email case and its investigation of Trump-Russia to be "credible." "It looks like there was a rush to clear her. It looks like the fix was in. I know the Democrats don't want to hear that. ... It stinks to high heaven, but Democrats have visions of impeachment dancing in their heads," he said. Grassley's floor speech comes as he's looking for information on Peter Strzok, an FBI agent removed from special counsel Robert Mueller's investigative team over messages critical of Trump. Grassley's floor speech comes as he's looking for information on Peter Strzok, an FBI agent removed from special counsel Robert Mueller's investigative team over messages critical of Trump.