Former U.S. House Speaker Dennis Hastert has been ordered to report to prison by June 22 to begin serving a 15-month sentence in his hush-money case, according to court documents.

U.S. District Court Judge Thomas Durkin entered an order Thursday that says Hastert must surrender "to the designated institution" by 2 p.m. that day. The order, mailed to Hastert, doesn't identify the prison. A Bureau of Prisons spokesman said that information won't be released until Hastert reports.

Hastert pleaded guilty to violating banking laws while seeking to pay $3.5 million to someone he sexually molested.

His lawyer said last week that Hastert would not appeal the conviction.

Get Breaking News Delivered to Your Inbox

An appeal would have been a longshot.

Durkin described the 74-year-old Republican from Illinois as "a serial child molester" during his sentencing last month in Chicago. He said Hastert abused at least four boys when he coached wrestling at an Illinois high school.

Hastert also paid a $250,000 fine.