Noted hawks such as Sens. Lindsey Graham (R-S.C.) and Marco Rubio (R-Fla.) have suggested they are open to allowing more refugees into the United States, though Rubio told a Boston radio station that the United States has to be able to ensure they aren’t part of a terrorist organization. 

But others, such as Wisconsin Gov. Scott Walker (R) and GOP front-runner Donald Trump, have opposed the notion that the U.S. should do more.

The opposing positions are likely to continue dividing Republicans, who are torn between heartbreaking images of refugees fleeing violence and the prospect of opening the country up to immigrants with potentially murky backgrounds.

The refugee crisis was buried during the August recess, and beneath talks about the Iran nuclear deal and budget fights now that lawmakers have returned, but is likely to rise to center stage in coming weeks.