Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE cautioned House Democrats on Wednesday against rushing to impeach President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE following the release of 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's report.

"Congress should hold substantive hearings that build on the Mueller report and fill in its gaps, not jump straight to an up-or-down vote on impeachment. In 1998, the Republican-led House rushed to judgment. That was a mistake then and would be a mistake now," Clinton, who ran against Trump in 2016, wrote in an op-ed published in TheWashington Post.

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The op-ed comes after Clinton on Tuesday threw her support behind Speaker Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.), who has hesitated to take up impeachment.

"I think Nancy is right to be cautious about making sure whatever is done in this Congress is more in accord with the very careful approach of 1973 and '4," Clinton said while speaking at the Time 100 Summit, referring to impeachment proceedings against former President Nixon.

In her Wednesday op-ed, Clinton again called on Congress to follow the precedent set by Watergate.

"Then, as now, there was an investigation that found evidence of corruption and a coverup. It was complemented by public hearings conducted by a Senate select committee, which insisted that executive privilege could not be used to shield criminal conduct and compelled White House aides to testify," she wrote. She also said that Mueller, former White House counsel Don McGahn and "other key witnesses" should testify.

Clinton called on Congress to create an independent commission on election security, saying that Trump "has proved himself unwilling to defend our nation from a clear and present danger."

"We have to get this right," she wrote. "The Mueller report isn’t just a reckoning about our recent history; it’s a warning about the future. Unless checked, the Russians will interfere again in 2020, and possibly other adversaries, such as China or North Korea, will as well. This is an urgent threat."