House Minority Leader 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.) said in an interview published Sunday that 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 could still be impeached even if 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 does not indict him in his Russia investigation.

"Recognize one point. What Mueller might not think is indictable could be impeachable," Pelosi told The Atlantic.

Pelosi said, however, that she wants to see irrefutable evidence so that Republicans would join any impeachment effort.

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Some Democrats, notably top donor Tom Steyer, have argued that Trump has already committed impeachable acts.

"What you have is a president who has declared war on the Constitution publicly this week. If that’s not obstruction of justice, what is obstruction of justice?” Steyer told The Atlantic regarding Pelosi's comments.

He added that he has a deep respect for Pelosi, but commented: “My blood just popped out the top out of my head.”

The president has come under fire for appointing Matt Whitaker Matthew G WhitakerEx-federal prosecutor: 'Thank God' Whitaker is gone, Barr will bring 'integrity' back to DOJ GOP pollster says Dems are relitigating 2016 election with investigations of Trump Former senior FBI official calls Whitaker hearing ‘disgraceful’ MORE to replace Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE.

Whitaker previously criticized the Mueller probe, which he will oversee as acting attorney general.

Pelosi in a separate interview with CBS News's Margaret Brennan attacked Whitaker's appointment.

"It does violence to the Constitution and the vision of our founders to appoint such a person in such a manner to be the chief legal officer in our country. And that's bipartisan," Pelosi said.

A poll released last week showed voters are split on whether House Democrats should immediately begin impeachment proceedings against Trump.

The American Barometer survey, conducted by Hill.TV and the HarrisX polling company, found that 40 percent of registered voters polled said House Democrats should begin impeachment proceedings, while 41 percent said Democrats in the chamber should not begin the process.