Donald Trump's populist, politically incorrect language is often framed as an asset but a troubling escalation in his incendiary rhetoric is prompting fears over the potential for violence among his inflamed supporters. In recent days, the irascible former US president and 2024 candidate has implied that the country's top military officer should be executed and joked about the elderly husband of a political foe being attacked in a home invasion. Critics say he hit a new low last week with comments about illegal immigrants so extreme that the Anti-Defamation League, a Jewish advocacy group, saw echoes of Nazi rhetoric. "Nobody...