WASHINGTON — Commissioner Bud Selig expressed confidence Sunday that an agreement can be reached to strengthen baseball's drug-testing policy.

"There's negotiations ongoing," Selig said during the inaugural game at Nationals Park. "I'd rather not comment other than that."

Selig said "Yes" when asked if was confident of an agreement with the players' union. He also cited the lack of reliable test for human growth hormone as a significant hurdle to cleaning up the sport.

"It's not perfect," Selig said. "It's going to change. There are chemists out there working."

President Bush said he thought December's Mitchell Report "was part of the cleansing process."

"I'm happy with the recognition that it was a problem," Bush said during the ESPN broadcast. "I certainly hope the players continue to work to clean up the sport."

ANGELS MOVES: Pitcher Darren O'Day, a non-roster player, became a member of the Los Angeles Angels while infielders Brandon Wood and Kendry Morales were sent to the minor leagues. O'Day, a 25-year-old right-hander, went 3-0 with a 2.04 earned-run average as a reliever. In 17 2/3 innings, O'Day allowed 12 hits and five walks while striking out 14 batters. Besides Wood and Morales, seven other Angels were sent down: pitchers Nick Adenhart and Alex Serrano, outfielders Dee Brown and Terry Evans, catchers Ryan Budde and Bobby Wilson and infielder Hainley Statia. All but Statia were sent to Triple-A Salt Lake City. Statia was sent to Double-A Arkansas.

Four pitchers — Chris Bootcheck, Kelvim Escobar, John Lackey and Scot Shields — were placed on the 15-day disabled list retroactive to March 21.