Scuffles have broken out at a rally in Arizona - after billionaire Donald Trump launched another attack on Mexican immigrants.
He's trying to drum up support for his bid to secure the Republican nomination for the American presidency next year.
Last month, he caused outrage by suggesting many Mexicans migrating to the States were drug runners and rapists.
At a rally today he targeted them again - saying they were having a detrimental effect on the US economy;
