Steve Bannon's trial tribulations may have only just begun as he readies himself for prison and the district attorney who secured former President Donald Trump's criminal conviction prepares to take him to court in New York, a former federal prosecutor said Thursday night.

Glenn Kirschner appeared on MSNBC to discuss with Lawrence O'Donnell a Washington D.C. federal judge's decision to put Bannon in a federal prison for four months for ignoring a congressional subpoena from the Jan. 6 investigative committee.

"Ironically," Kirschner said, "a four-month prison term might end up being the least of Steve Bannon's problems."

Kirshner then pointed to Manhattan District Attorney Alvin Bragg's criminal indictment of Bannon on money laundering charges and a trial slated to begin in the courtroom of Justice Juan Merchan — the same judge who oversaw Trump's hush money trial — on Sept. 23.

Bannon stands accused of fleecing thousands of Trump supporters upwards of $15 million through the Florida nonprofit corporation WEBUILDTHEWALL, promising a border security project that never materialized, court records show.