Washington (CNN) Prosecutors, defense attorneys and the judge are hashing out the final details of Paul Manafort's trial with just eight days to go before it begins -- including whether five witnesses will be forced to testify and if the schedule will change.

The former Trump campaign chairman's jury trial in the federal District Court for the Eastern District of Virginia begins July 25. He faces 18 charges of bank fraud and foreign bank account allegations. If found guilty he could face a sentence of more than 300 years in prison. He is currently in jail in Alexandria, Virginia, for alleged witness tampering, after losing his bail in a separate criminal proceeding.

Witness immunity

Special counsel Robert Mueller asked the judge on Tuesday to sign off on immunity for five unidentified witnesses slated to testify against Manafort beginning next week.

If granted, that means the witnesses' testimony couldn't be used against them in later court cases.

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