More than half of Americans are not aware that 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 probe into Russian interference in the 2016 presidential election has uncovered crimes, according to a new survey from the progressive group Navigator.

The poll found that 59 percent of those surveyed by the left-leaning pollsters believe Mueller has not discovered any crimes, while 41 percent believe that he has.

Navigator is a group comprised of Democratic strategists and pollsters. Its polling project is focused on sharpening the midterm message against President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE and Republicans.

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President Trump's former campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE is among those who have been indicted.

The Navigator poll also found that nearly all of those surveyed have at least heard of the Mueller investigation. Forty-nine percent said they've heard a lot about it, while 32 percent said they've heard some, 15 percent said they've heard a little, and just 3 percent said they've heard nothing about the probe.

Trump has stepped up his attacks on the Mueller probe in recent days. He targeted rumors, in a tweet on Wednesday, that there was a spy placed in his campaign.

The president tweeted that the “Criminal Deep State” is “caught in a major SPY scandal the likes of which this country may never have seen before!” Trump tweeted.

Look how things have turned around on the Criminal Deep State. They go after Phony Collusion with Russia, a made up Scam, and end up getting caught in a major SPY scandal the likes of which this country may never have seen before! What goes around, comes around! — Donald J. Trump (@realDonaldTrump) May 23, 2018

His tweets came after a meeting with Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE and FBI Director Christopher Wray, after Trump demanded an investigation into the surveillance of his campaign.

The Department of Justice earlier this week asked its inspector general to look into whether the FBI surveilled Trump's campaign.

The Global Strategy Group conducted the survey among a sample of 1,219 registered voters from May 11-16.

Updated at 5:35 p.m