For months, Republican presidential contenders have blasted the administration's campaign against IS as woefully inadequate. Now, they are disputing White House assurances that Syrians granted U.S. asylum will be subjected to thorough screening and vetting.

"You have a thousand people come in, and 999 are just poor people fleeing oppression and violence. But one of them is an ISIS fighter. If that is the case, then you have a problem, and there is no way to vet that out," said Republican Senator Marco Rubio. "You cannot pick up the phone and call Syria."

At Saturday's debate among Democratic presidential hopefuls, Hillary Clinton pointedly disagreed with Obama's assertion last week that the Islamic State group has been contained.

White House officials say the president was referring to the territory controlled by IS in Iraq and Syria, not the terrorist threat posed by the group.

Vocabulary

sanctuary：(圣经)圣幕，圣堂

vigilant：警惕的

asylum：庇护；收容所

assertion：断言，声明

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