Perhaps the number 1 issue on Donald Trump’s priority list is immigration. Trump promises mass deportations of millions of undocumented migrants if he wins the election.

During a rally in Colorado, trump card said it would target “every illegal immigrant criminal network operating on American soil.” His plan is to use a 1798 law “previously used to detain ‘enemy aliens'” during wartime, he said Axios. Critics say the Alien Enemies Act of 1798 could also be used to detain “legal immigrants and their US-born children.” But a Trump spokesman said Americans “want mass deportations of illegal immigrants and have the utmost confidence in President Trump on this issue.”