Louis DeJoy, the head of the U.S. Postal Service, intends to step down, the federal agency said Tuesday, after a nearly five-year tenure marked by the coronavirus pandemic, surges in mail-in election ballots and efforts to stem losses through cost and service cuts. In a Monday letter, Postmaster General DeJoy asked the Postal Service Board of Governors to begin looking for his successor. “As you know, I have worked tirelessly to lead the 640,000 men and women of the Postal Service in accomplishing an extraordinary transformation,” he wrote. “We have served the American people through an unprecedented pandemic and through...