Donald Trump's rhetoric since the Paris terrorist attacks appears to have helped him with GOP primary voters, according to most polls. But Republican insiders are concerned that his words could come back to haunt the party as it seeks to appeal to a broader audience.

In recent days, Trump has suggested that the United States could have "no choice" but to close mosques. Even more controversially, he told an NBC News reporter he would "certainly" implement a system to register and track Muslims, though it was unclear whether he was referring to new immigrants or all Muslims on American soil.

"Long term, that is not something we will do or should do," said GOP strategist Ed Rollins, who has worked for past Republican presidential campaigns, including those of former Arkansas Gov. Mike Huckabee in 2008 and former Rep. Michele Bachmann (Minn.) in 2012.

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