JUST IN: Donald Trump vows to launch the biggest deportation operation in American history if elected president.
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Trump also revealed what he would do if other countries refused to take back the illegals.
"On day one I will seal the border and we'll begin the largest domestic deportation operation in the history of our country."
"If other countries say they won't take them back... I will say: 'Yeah. Here they come. Hold onto your britches 'cause they're coming back.'"