NEW YORK — Baseball commissioner Bud Selig says the sport's drug-testing program was threatened when federal prosecutors seized player records and samples in 2004.

In a letter released by a congressional committee, Selig says the seizure jeopardized the program's confidentiality and caused a delay in the start of testing that year.

Reps. Henry Waxman and Tom Davis, leaders of the House Committee on Oversight and Government Reform, asked Selig and union head Donald Fehr last month to respond to questions about their March 2005 testimony before the panel. The congressman wanted to know why the delay in 2004 wasn't disclosed during that hearing.

Fehr said information couldn't be revealed because of a court order that kept details of the dispute under seal.