Sam Brown, a retired Army captain and current Republican frontrunner for the Nevada Senate nomination, has touted his MAGA credentials, pushed conspiracy theories about the 2020 presidential election and proclaimed former President Donald Trump’s criminal trial and conviction a “sham.” But when confronted Tuesday by a reporter about his remarks, Brown wouldn’t elaborate on how the trial was a sham — and simply changed the subject to his get-out-the-vote effort. The statement garnered scorn on social media from anti-Trump voters — and drew anger from pro-Trump voters enraged that he didn’t do m…