By Travis Gettys Attorney general Merrick Garland has pledged to uphold the rule of law in what sounds like a challenge to Donald Trump, and a recent speech signaled the former president’s threats haven’t intimidated him to change his mind. The twice-impeached ex-president has made veiled and not-so-veiled threats of street violence erupting if he’s indicted in one of the various criminal investigations targeting him and his family business, but Garland directly challenged those warnings in a speech over the weekend at Ellis Island, according to The Bulwark columnist Charlie Sykes. “The Rule o…