The committee, chaired by Democratic investigative ace Rep. Henry Waxman, has also asked Clemens’s longtime workout buddy Andy Pettitte to testify, as well as another prominent former New York Yankee, Chuck Knoblauch, and two admitted suppliers, Kirk Radomski and Brian Mc Namee, whose testimony was central to former senator George Mitchell’s findings on alleged steroid use by major- league players. Mitchell said McNamee told him that he had personally injected Clemens with steroids. Clemens has ve hemently denied ever using performance-enhancing drugs; in an interview with “60 Minutes” on Sunday, he said that McNamee had injected him with vitamin B12 and lido caine, a legal painkiller. “Roger is willing to answer questions, including those posed to him under oath,” said Clemens’s lawyer, Rusty Hardin, in a statement. “We hope to deter mine shortly if schedules and other commitments can ac commodate the committee on that date.” A lawyer for Mc Namee could not immediately be reached for comment.