U.S. Republican candidates vow tougher approach on Islamic State

U.S. Paratroopers from the 82nd Airborne Division based in Fort Brag, N.C. , participate in a massive airdrop from C-17 Globemaster aircraft as part of the NATO Exercise Trident Juncture 2015 military exercise, NATO's largest joint and combined military exercise in more than a decade, at the San Gregorio training grounds outside Zaragoza, Spain, November 4, 2015. REUTERS/Paul Hanna

WASHINGTON (Reuters) - Republican presidential candidates vowed on Monday to take a tougher approach towards Islamic State militants, with Jeb Bush saying a larger Middle East troop presence is needed and Donald Trump saying he would consider closing some mosques in the United States.

The impact of Friday's attacks in Paris on the U.S. campaign for the November 2016 presidential election has been swift and powerful, with national security thrust back to the top of voter concerns.