Roger Clemens’ attorney revealed Tuesday that the ex-baseball star plans to begin his defense against charges of lying to Congress by questioning whether lawmakers’ investigation into whether he used performance-enhancing drugs was proper.

Clemens attorney Michael Attanasio said in court that the hearing the House Oversight and Government Reform Committee held in February 2008 had nothing to do with Congress’ responsibility for legislation. He said the hearing was only concerned with airing a “credibility contest” between Clemens and his longtime trainer, Brian McNamee, who said he injected the pitcher with steroids and human growth hormone.