U.S. Postal Service police barred Congresswoman Debbie Wasserman Schultz from entering two mail sorting facilities in Florida in the early morning hours on Friday, threatening to escort her from the property if she didn’t leave.

The Florida Democrat, who sits on the House Oversight Committee, said she aimed to inspect a mail plant in Opa-locka and Northwest Miami-Dade. Wasserman Schultz said union members told her about conditions at the processing centers and shared pictures that showed pallets of undelivered mail marked with a receipt date of “July 23.”

Her office said those photos were sent to them earlier this week and raise further questions about how the Postal Service is being run under the leadership of Postmaster General Louis DeJoy, a close ally of President Donald Trump. NBC News was not able to independently verify the photo of the reportedly undelivered mail.