By Ted Hesson and Mica Rosenberg WASHINGTON (Reuters) -The United States will end a sweeping, pandemic-related expulsion policy that has effectively closed down the U.S. asylum system at the border with Mexico, U.S. health officials said on Friday, arguing it was no longer needed to protect public health. The Title 42 order will remain in effect until May 23 to allow border officials time to prepare for its termination and to ramp up COVID-19 vaccines for arriving migrants, the Centers for Disease Control and Prevention (CDC) said in a 30-page order. “After considering current public health co…