WASHINGTON (AP) — The House Oversight Committee has invited the new postmaster general to appear at a hearing next month to examine operational changes to the U.S. Postal Service that are causing delays in mail deliveries across the country.

The plan imposed by Louis DeJoy, a Republican fundraiser who took over the top job at the Postal Service in June, eliminates overtime for hundreds of thousands of postal workers and orders that mail be kept until the next day if postal distribution centers are running late.

Rep. Carolyn Maloney, a New York Democrat who chairs the Oversight panel, said the...