If the U.S. Postal Service gets its way, the price of a first-class stamp will go up for the fourth time in a year.

If the plan is approved, the price hike would be the highest stamp increase ever.

The U.S. Postal Service will increase stamp prices and the cost of shipping packages this Sunday.

Leaders at the U.S. Postal Service expressed confidence Wednesday that mail will be delivered on time this holiday season.

The U.S. Postal Service is adding facilities, hoping for a smoother holiday season this year. Meanwhile, the U.S. labor shortage shows no sign of letting up. ABC’s Megan Tevrizian reports.

Louis Dejoy said the postal service is adding capacity and will be ready for the holiday season.

The move comes after a plan was proposed for the U.S. Postal Service to slow some mail delivery, reduce hours and charge higher rates.

First class mail sent long distance could take a day or two longer to arrive and mail sent within the same area is expected to have the same two-day delivery time.

Starting Oct. 1, the USPS will begin to slow down first-class mail as a way to save on transporting costs and as part of its 10-year plan to modernize the entire operation.

A bipartisan group of 20 senators introduced legislation Wednesday to provide financial relief to the struggling U.S. Postal Service while also tightening accountability.

Louis DeJoy apologized to the House Oversight Committee for slow mail delays last year but reaffirmed his intention to remain as the head of the USPS, telling one Democrat: “Get used to me.”

USPS unveils new mail trucks.

Postmaster General Louis DeJoy apologized Wednesday for what he called "unacceptable" mail delays during the holiday season.

Postmaster General Louis DeJoy caused controversy with changes to the USPS.

Griswold is concerned about USPS mailers sent to registered voters which contain inaccurate mail-in voting information.

As concerns grow about mail-in voting, members of the House voted to give the Postal Service $25 billion to handle the expected influx of mailed-in ballots.

The Postal Service apologized for the delay, but said remains were not lost.

The bill prioritizes all official election mail as first class, and prohibits the removal of sorting machines and mail boxes.

A Connecticut woman said her veteran brother’s remains were lost for 12 days.

A dispute between two Senators near the end of the Obama administration sparked a series of events that contributed to the current controversy at the U.S. Postal Service.