Immigration officers are becoming 'extreme' in how they vet travelers entering the U.S.

The Wall Street Journal's Michelle Hackman tells NPR's Ayesha Rascoe about the "extreme vetting" tactics international visitors say U.S. border officials are employing. AYESHA RASCOE, HOST: If you have a green card or a valid visa, entering the U.S. is usually a straightforward affair. Border …