A day before he’s set to surrender and serve a four-month sentence in federal prison, former President Donald Trump’s adviser Peter Navarro described himself as a MAGA martyr in an interview with Don Trump Jr. “You’re literally reporting to prison tomorrow … and yet you’re here and talking about MAGA principles for the next term,” Trump Jr. said during an episode of his Rumble show “Triggered” Monday. “Just so people understand the kind of warrior you actually are.” And Navarro, who served in Trump’s cabinet as a trade adviser, replied that he’s fighting just like other American patriots who…