A judge has set a March 30 guilty plea for a Michigan man who is accused of amassing weapons and having ties to Islamic State.

No other details were disclosed Tuesday besides a date for a change-of-plea hearing in front of a Detroit federal judge.

Sebastian Gregerson has been locked up since August. He's charged with possessing an unregistered destructive device and receiving explosive materials without a permit. His defense lawyer says Gregerson simply is a survivalist.

But in a December court filing, prosecutors said he was stockpiling weapons on behalf of Islamic State. The government says Gregerson is an American Muslim who converted to Islam after high school.