Republican U.S. presidential candidates (L-R) Senator Marco Rubio, Dr. Ben Carson, businessman Donald Trump, Senator Ted Cruz and former Governor Jeb Bush hold their hands over their hearts for the singing of the U.S. national anthem before the start of the Republican presidential debate in Las Vegas, Nevada December 15, 2015. REUTERS/Mike Blake
LAS VEGAS (Reuters) - Challenger Jeb Bush locked horns with Republican front-runner Donald Trump in a national security debate on Tuesday but most rivals avoided tangling with the billionaire who has emerged as an enduring force in the 2016 U.S. presidential campaign.
Their reticence was a nod to Trump's unique ability to withstand attacks and return fire. Last week, Trump stunned the field by proposing to ban Muslims from entering the United States, a move his rivals assailed only to find many Republican voters backed the idea and Trump's lead in opinion polls grew.
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