Trump's threat to dump thousands of ISIS fighters into Europe could end up hurting its fiercest ally in Syria

President Donald Trump on Wednesday threatened to dump thousands of ISIS prisoners in Europe if the countries they originated from refused to take them back in.

Speaking to reporters at the White House, Trump specifically mentioned France and Germany as two countries where its citizens who pledged their loyalty to ISIS could be dropped off.

"We're holding thousands of ISIS fighters right now, and Europe has to take them," Trump said. "If...