TAMPA, Fla. -- For the second successive year, Andy Pettitte's spring has included a Roger Clemens-related trip to Washington, D.C., but the Yankees left-hander is opting to remain silent about his time there.

Drug Policy in Baseball

The Associated Press reported that federal prosecutors interviewed Pettitte last Tuesday as they continue to investigate whether Clemens lied to Congress when he denied using performance-enhancing drugs.

The report cited two people familiar with the case, speaking on condition of anonymity because they were not authorized to discuss the ongoing investigation.

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"It's really not anything that I would like to comment on," Pettitte said on Wednesday at the Yankees' Spring Training complex. "Anything that has to do with that situation, I don't think it's appropriate to comment on."

Pettitte could be an important witness in a case against Clemens, having trained together for years. Pettitte has acknowledged taking human growth hormone, and he told congressional investigators that Clemens informed him nearly a decade ago that he used HGH.

Prosecutors are weighing whether to bring perjury charges against Clemens for denying under oath to Congress that he took performance-enhancing substances.

The AP reported that Pettitte had already told Congress much of what investigators wanted to know, and that it is unclear if Pettitte has been called before a grand jury. Because Pettitte has already given a sworn statement, prosecutors do not necessarily have to use the grand jury to make their case.

Asked if he thought the Clemens investigation would require another return to Washington, Pettitte again declined comment.

"I want to focus on being right here with this team and me playing baseball," Pettitte said.