Social Security chief fires back at Warren over agency 'mismanagement' claims with performance data

The Trump administration's Social Security commissioner on Monday hit back at criticisms of "mismanagement" leveled by Sen. Elizabeth Warren, D-Mass., against the agency's changes to its customer service practices.Frank Bisignano, commissioner of the Social Security Administration (SSA), responded to Warren's criticisms in a letter exclusively reviewed by FOX Business ahead of its release. He defended the administration's changes and wrote that the SSA is "experiencing a customer service turnaround after four years of long wait times and record backlogs under the Biden administration.""While I