Republican presidential nominee Donald Trump, visiting the U.S.-Mexico border in Arizona Thursday just hours before Vice President Kamala Harris' nomination as the Democratic Party's standard-bearer becomes official, insisted that she and President Joe Biden have "unleashed a deadly plague of migrant crime" on the United States and that she has failed in her duties as President Joe Biden's "border czar." "Comrade Kamala Harris, I call her comrade because she is a radical left Marxist," Trump...