SAN LUIS, Arizona (AP) – President Donald Trump visited the U.S.-Mexico border Tuesday and tried to credit his new wall with stopping both illegal immigration and the coronavirus. But his visit played out as top public health officials in Washington were testifying about the ongoing threat posed by COVID-19, singling out Arizona as one of the states now experiencing a surge in cases. In the blazing summer heat, Trump along with top administration, Border Patrol and Arizona officials briefly stopped to inspect a new section of the concrete and rebar structure. The president and other officials took a moment during the brief visit to scrawl their signatures on the wall.