WATCH: Donald Trump Speaks at March 3 Rally in Portland, Maine



Republican frontrunner Donald Trump will address supporters at a rally in Portland, Maine, Thursday afternoon. The billionaire real estate mogul will likely fire back at former Republican presidential nominee Mitt Romney, who attacked Trump during a speech earlier Thursday.

“Let me put it plainly, if we Republicans choose Donald Trump as our nominee, the prospects for a safe and prosperous future are greatly diminished,” Romney said during the speech.

You can watch the Trump rally live by clicking here.

Trump and three Republican challengers, Texas Senator Ted Cruz, Florida Senator Marco Rubio and Ohio Governor John Kasich, will debate Thursday night in Detroit, Michigan, at 9 p.m. Eastern on Fox Newws: