There are moments in American foreign policy when the warning signs are flashing so brightly that failing to act becomes its own form of negligence. This is one of those moments. Senator Ted Cruz and his fellow sponsors of S. 4063 are not engaging in political theater. They are responding to a gathering national security threat that too many in Washington have either underestimated or deliberately ignored for years: the growing cooperation between the Polisario Front and Iranian-backed terrorist networks operating across North Africa and beyond. The Senate should move quickly to advance this legislation. Not because it is politically...