A terror attack by a married, Pakistan-origin couple in California has shaken up American politics and the presidential contest, setting in motion stricter restrictions on grant of some U.S. visas and prompting candidate Donald Trump to propose a temporary ban on Muslims entering the United States. But the attack and the reactions also raise a larger question: Has the U.S. evolved a clear and credible counterterrorism strategy after spearheading the global war on terror since 2001?

President Barack Obama's first Oval Office address in five years, while aimed at calming a jittery American public after the California attack, has only widened the gap between U.S. rhetoric and the challenge of effectively combating the international spread of Islamist extremism and terrorism.

Obama admitted that, in recent years, "the terrorist threat has evolved into a new phase" and sought to reassure Americans that "we will overcome it." Yet, as if to underscore his incoherent and ineffectual approach, his Dec. 6 speech was conspicuous by its omission of any reference on how to combat increasing Muslim radicalization, which is spawning violent jihadists.