text:  Meanwhile, Mr Trump's former chief strategist, Steve Bannon, has begun serving a four-month prison term for defying a congressional subpoena. Mr Bannon described himself as a political prisoner as he arrived at a low-security federal jail. Speaking to the BBC's Sarah Smith before his imprisonment, Mr Bannon said he remains focused on raising a so-called MAGA army to contest the result of the 2024 presidential vote, and that being behind bars wouldn't change that.