Trump's rhetoric has taken a darker turn in his final campaign sprint before the Iowa caucuses, with the former president claiming migrants are "poisoning the blood" of the US and quoting Russian President Vladimir Putin. Trump cited Putin claiming Trump's legal troubles show the "rottenness" of the US political system. The former president also invoked the Alien Enemies Act and promised to divert the FBI and DEA to border security actions. Trump rivals like Chris Christie allege the former president's rhetoric is getting darker as legal walls close in on him.