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 has again delayed scheduling a sentencing hearing for former national security adviser Michael Flynn.

“Due to the status of its investigation, the Special Counsel’s Office does not believe that this matter is ready to be scheduled for a sentencing hearing at this time,” read a joint status report released Tuesday.

Tuesday’s delay is the fourth time prosecutors have asked to delay Flynn’s sentencing.

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Both parties will now be required to submit status reports by Sept. 17. Mueller had previously asked for status reports by Aug. 24, when he delayed scheduling the sentencing at the end of June.

Flynn pleaded guilty to lying to the FBI during their investigation of Russian interference in the 2016 election in December. Prosecutors say Flynn lied to FBI investigators about his contact with then-Russian Ambassador Sergey Kislyak.

Flynn served in Trump's 2016 presidential campaign and briefly as the president’s national security adviser before he was fired in February 2017 for misleading the White House about his Russian associations.

As an element of his guilty plea, Flynn has been cooperating with Mueller’s team in its ongoing investigation of alleged collusion between the Trump campaign and Russia.