Trump said Clinton had no evidence to back up a charge she made during a debate on Saturday that the Republican frontrunner is becoming the extremist group's 'best recruiter'.

"She's a liar and everybody knows that," Trump said. "She just made this up in thin air."

Trump's call to ban all Muslims from entering the United States following a Jan. 2 attack in San Bernardino, California that killed 14 people has drawn widespread criticism from Republican rivals as well as Democrats like Clinton.

During Saturday night's Democratic debate, Clinton said Islamic State is using Trump's rhetoric to enlist fighters to radical jihad.

Asked to comment yesterday, the Clinton campaign did not respond to Trump's charge but reiterated that Hillary Clinton's remark was based on evidence that supporters of the extremist group frequently cite Trump's comments to make the case that Americans hate Muslims.

It quoted a counterterrorism expert and linked to a tweet from a "very vocal ISIS supporter."   

Still, Trump's comments make it harder for the United States to build good will among Muslim populations and make him complicit in Islamic State mobilization efforts, said Democratic strategist Bud Jackson.

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