Andrew McCabe is suing the Trump administration.

Former FBI Deputy Director Andrew McCabe has sued the Trump administration for what he calls his “unlawful” termination, arguing that his firing last year was the result of improper political interference by the president.

“It was Trump’s unconstitutional plan and scheme to discredit and remove DOJ and FBI employees who were deemed to be his partisan opponents because they were not politically loyal to him,” the complaint alleges.

The star witness will be Trump’s Twitter account.