A House panel issued a subpoena Wednesday to try to force Postmaster General Louis DeJoy to turn over documents Democrats demanded last month at a hearing on mail delivery problems.

Oversight and Reform Committee Chairwoman Carolyn Maloney gave DeJoy a Sept. 16 deadline to comply with the subpoena, which seeks information about the removal of mail sorting machines, mailboxes, and other “policies and practices” that may be slowing mail delivery.