Illinois Governor JB Pritzker, a Democrat, was among those that blamed Republican President Donald Trump for the hike, saying it should be called the “Trump Mail Tax.” Newsweek has contacted the White House via email for comment.

Postmaster General David Steiner is testifying before the House Oversight and Government Reform Committee on Tuesday afternoon about the financial future of the United States Postal Service. The

Postmaster General David Steiner warned USPS will run out of cash by February, and both parties agreed on the need for the deepest cuts in the agency's history.

Postmaster General David Steiner testified before Congress on the current state of the U.S. Postal Service. (Pool)