Donald Trump supporters across the US have lashed out against his proposal to create a path to citizenship for nearly two million "Dreamer" immigrants.

Some immigrants used false documents to enter the United States, others let their legal visas expire once in the country. And at least 21 foreign nationals became naturalised US citizens before being charged or convicted as terrorists.

The number of immigrants living illegally in the United States jumped by a million in under four years, the government reported.