Trump launches into 'dark speech' on illegal immigration

Prairie du Chien, United States: Donald Trump on Saturday called Democrat Kamala Harris mentally impaired and said illegal immigrants are out to cut...

Prairie du Chien, United States: Donald Trump on Saturday called Democrat Kamala Harris "mentally impaired" and said illegal immigrants are out to cut the throats of ordinary Americans in their own homes as he doubled down on the racially charged rhetoric fueling his unprecedented bid to regain the US presidency.

Trump was seeking to strike back at Harris after she visited the US-Mexico border on Friday and vowed to do more to control asylum claims and undocumented migrant crossings.

The issue is one of the Democratic vice president's weakest in polling, as she runs neck-and-neck against Trump in the November 5 election.

Trump dismissed Harris's speech at the border, swearing and telling supporters in the small town of Prairie du Chien, Wisconsin, that President Joe Biden and Harris are responsible for an "invasion" of violent criminals.

Anti-immigrant sentiment has been at the core of Trump's appeal in economically depressed, majority-white parts of the country ever since his 2016 presidential victory, but the rhetoric is turning ever more extreme as election day nears.