GOP presidential front-runner Donald Trump said he will send Syrian refugees back to their country out of fear that that they could be Islamic State militants.

"I'm putting the people on notice that are coming here from Syria as part of this mass migration," Trump said during an evening rally in Keene, New Hampshire on Wednesday. "If I win, they're going back."

The billionaire said the refugees, who have been fleeing their country due to years of civil war, could actually be Islamic State militants in disguise trying to sneak their way into the country.

"This could be one of the great tactical ploys of all time, a 200,000-man army, maybe. That could be possible," Trump said.

His comments come after the Obama Administration vowed to increase the amount of refugees taken into the U.S. by next year. Specifically, the U.S. is intended to take in more refugees from Syria, the Middle East and parts of Africa as conflict continues to worsen.

The U.S. stepped up after a boy and 12 other people drowned on a home-made boat while trying to cross the ocean to Greece. Shocking images of the boy's dead body circulated the internet, showing the world how Syrian refugees are struggling in their own home.

"The situation on the islands is dramatic in terms of the sheer numbers flowing in, lack of shelter and ever worsening hygiene conditions," Ketty Kehayioy, the UNHCR's spokeswoman in Athens told The Guardian at the time.  

"The absence of staff to conduct registrations is creating enormous bottlenecks on Lesvos and Kos which is further exacerbating substandard conditions, conditions themselves worsened by very limited facilities," she added.

Millions of refugees have already fled to neighboring European countries and nearly 2,500 people have died trying to cross the Mediterranean. The civil war has claimed more than 250,000 lives in the past four years of conflict.