Former Secretary of State and Democratic 2016 frontrunner Hillary Clinton weighed in Tuesday on the talk among Republicans to ban Syrian refugees, and specifically Muslim refugees. On Twitter, she called the rhetoric “hateful” and said that “the idea that we’d turn away refugees because of religion is a new low.”

We’ve seen a lot of hateful rhetoric from the GOP. But the idea that we’d turn away refugees because of religion is a new low. -H — Hillary Clinton (@HillaryClinton) November 17, 2015

A number of GOP lawmakers and White House candidates have called for a suspension of plans under President Obama’s refugee resettlement program to accept 10,000 Syrians in the next fiscal year. Some Republicans, such as 2016er Sen. Ted Cruz (R-TX), have suggested that only Syrian Christians and Jews who have been persecuted under the Islamic State should be allowed to settle in the United States while Syrian Muslims are barred from entering the country.

President Obama slammed the idea Monday, saying, “That’s not American. That’s not who we are.”