The Department of Homeland Security (DHS) on May 28 walked back comments made by the agency’s chief, who suggested earlier in the day that the federal government was “taking a very close look” at the idea of requiring vaccine passports to enter or leave the United States. “Looking ahead to summer, Europe and other countries are going to open up. Could we see vaccine passports to travel internationally either into or out of the U.S.?” an ABC “Good Morning America” host asked DHS Secretary Alejandro Mayorkas. “We’re taking a very close look at that,” Mayorkas responded. But DHS said Mayorkas was only speaking about how Americans will need such documentation to enter other countries. “We’ve always said we’re looking at how we can ensure Americans traveling abroad have a quick and easy way to enter other countries. That’s what the secretary was referring to: Ensuring that all U.S. travelers will be able …