Former U.S. attorney Preet Bharara Preetinder (Preet) Singh BhararaDemocratic attorneys criticize House Judiciary Democrats' questioning of Barr Clyburn echoes calls to rename Pettus bridge Support swells for renaming Edmund Pettus Bridge in Selma to honor John Lewis after his death MORE said Sunday that President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE should “be very worried” about his former national security adviser, Michael Flynn, potentially cooperating with the special counsel's investigation if Trump has “done bad things.”

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“It depends on what the president has done and what the president’s conversations with Michael Flynn and others have been,” Bharara told CNN’s “State of the Union” when asked if Trump should be concerned.

“But if you’ve done bad things, then you should be very worried,” he added.

Bharara previously said helping special counsel Robert Mueller may be the “only sane and rational move” left for Flynn, a comment that came after The New York Times reported that Flynn’s lawyers ended an agreement to share information with attorneys for Trump. The Times said the agreement's termination suggests Flynn may be working to cut a deal as the special counsel continues its probe into Russia's attempts to meddle in the U.S. election and any potential ties between Trump's campaign staff and the Kremlin.

“Also, prosecutors accept cooperation only if you can provide ‘substantial assistance.’ Higher up in the food chain. Stay tuned...,” Bharara said Friday.