Sen. Lindsey Graham predicted on Sunday that the report from the Justice Department’s internal watchdog will reveal evidence that top FBI officials manipulated and withheld information to launch the Russian investigation during the 2016 election.

“I think you’re going to see the system off the rails,” the South Carolina Republican said on Fox News’ “Sunday Morning Futures.” “I think you’re going to see members of the Department of Justice and FBI taking the law into their own hands.”

But Graham, the chairman of the Senate Judiciary Committee, cautioned that people shouldn’t “judge” Inspector General Michael Horowitz’s report until he testifies before the panel on Wednesday.

Graham said he hasn’t seen a copy of the review.

“I’m looking for evidence of whether or not they manipulated the facts to get the warrant and as to the counterintelligence investigation, why didn’t they tell President Trump that they suspected Carter Page and Papadopoulos of working with the Russians and if they didn’t tell him there’s a reason,” the senator said, referring to Trump campaign advisers Page and George Papadopoulos. “Counterintelligence is designed to protect institutions designed to protect Americans from foreign influence.”

Horowitz’s report is expected to be released on Monday, the same day the House Judiciary Committee will hold another impeachment hearing into the president’s actions in Ukraine.

Graham and Trump’s Republican allies have claimed that politically biased FBI officials began the Russia investigation in July 2016 and surveillance of Trump campaign associates.

The investigation was eventually taken up by special counsel Robert Mueller in May 2017.

Graham said the investigation was needed to get to the bottom of the controversy and ensure it doesn’t happen again.

“The only way to prevent it from happening again is people have to pay a price this time, so there will be no next time,” he said.

But the Associated Press reported on Sunday that Horowitz will conclude that while some law enforcement officials made errors, there were sufficient grounds to open the investigation, that it wasn’t the “witch hunt” described by Trump.

It will also say the Obama administration’s Justice Department did not target the Trump campaign in an effort to throw the presidential election toward Hillary Clinton.