Donald Trump says German Chancellor Angela Merkel's decision to accept thousands of Syrian refugees is 'insane."

“They’re going to have riots in Germany,” the Republican presidential hopeful said in an interview aired Sunday on CBS's "Face the Nation." “I always thought Merkel was, like, this great leader. What she’s done in Germany is insane. It’s insane… letting in that many people."

Merkel’s decision to open the doors to thousands of refugees stranded on their flight from war-torn Syria came as a surprise to some in Europe. And, last week, she defended her strategy against growing criticism. “We will manage,” she said.

Trump disagreed, calling on U.S. Middle East allies to help with the Syrian crisis — countries that Democratic presidential contender Sen. Bernie Sanders of Vermont also says could help more.

“What they should do is get all the countries together, including the Gulf States, which have nothing but money. They should all get together and they should take a big swath of land in Syria,” Trump said. “They should do a safe zone for people where they could live. And then ultimately go back to their country, go back to where they came from.”

The billionaire real estate developer and entertainer also reiterated the U.S. should limit the number of the refugees allowed into the U.S. “10,000, I'm not thrilled, but maybe. 200,000 people?” he asked.

“This could make the Trojan horse look like peanuts if these people turned out to be a lot of ISIS," Trump declared.