Sunday on State of the Union

PARIS, FRANCE - JANUARY 12: French troops patrol around the Eifel Tower on January 12, 2015 in Paris, France. France is set to deploy 10,000 troops to boost security following last week's deadly attacks while also mobilizing thousands of police to patrol Jewish schools and synagogues. (Photo by Jeff J Mitchell/Getty Images)

(CNN)As Europe escalates its crackdown on terror cells, we talk with the Senate Intelligence Committee Chairman Richard Burr and Senate Foreign Relations Committee member Chris Murphy about potential threats to the U.S.

Pope Francis' raised eyebrows this week when he said free speech has its limits when applied to religion. A rabbi, priest and imam offer their take.
Should Mitt Romney make another White House run in 2016? Two Republicans, Rep. Jason Chaffetz and former Virginia Attorney General Ken Cuccinelli join with the case for yes and no.
Chief National Security Correspondent Jim Sciutto hostsState of the Union on Sunday at 9am and Noon ET on CNN.