Former Major League Baseball pitcher Roger Clemens, left, waves as...

Former Major League Baseball pitcher Roger Clemens, left, waves as he arrives at federal court in Washington. (July 11, 2011) Credit: AP

WASHINGTON -- Attorneys for Roger Clemens said Tuesday that they'll challenge whether Congress had authority to hold a hearing on steroids that led to federal charges of perjury and lying against the former Yankees righthander.

In a preview of the first line of defense on the eve of Wednesday's opening statements, Clemens' lawyer Michael Attanasio said the Feb. 13, 2008, House hearing on the conflicting stories of Clemens and his former trainer Brian McNamee wasn't legitimate because it wasn't about existing or potential legislation.

"A credibility contest between Mr. McNamee and Mr. Clemens about private transactions, even if they are controlled-substance transactions allegedly, unrelated to the legislation, is not the due and proper exercise of the power of inquiry," Attanasio said.

U.S. Attorney Daniel Butler replied that the House Oversight and Government Reform Committee, which held the hearing, "has very broad jurisdiction as its title suggests. It's not just a matter of legislation."

U.S. District Judge Reggie Walton made no ruling but said he was leaning toward the government's view of congressional power.

Attanasio raised the issue as his defense team and prosecutors sifted through and chose a jury of 10 women and two men, and argued over instructions to jurors for the high-profile trial.

The former pitching ace is charged with perjury, making false statements and obstructing Congress for lying repeatedly as he denied, at that 2008 House hearing, using steroids and human growth hormone.

Prosecutors and the defense Wednesday will outline their cases.

The defense tipped its strategy in a filing in which it cited a Supreme Court case that said a hearing needs a legislative purpose.

But that case was about a man subpoenaed for questions he didn't want to answer. Clemens voluntarily appeared and answered questions.

Attanasio revealed the prosecutors' first two witnesses will be former House Parliamentarian Charles Johnson and Phil Barnett, the committee's chief counsel during the hearing.

And he poked fun at the time Congress spent probing whether Clemens went to a barbecue at ballplayer Jose Canseco's Florida home in 1998, at which they allegedly talked steroids.

"Apparently we're going to have a mini trial on whether Mr. Clemens was swimming on July 11, 1998," Attanasio said. "But it's not material to the due and proper exercise of Congress and it's not material to this court's inquiry about obstruction of justice."

Meanwhile, Walton said he was "discouraged" that Clemens' family members were using Twitter to make derogatory comments about McNamee and the father of pitcher Andy Pettitte, who was Clemens' best friend on the Yankees and who is slated to testify against him. The judge said he couldn't stop it but said the tweets "don't help the process."

Defense attorney Rusty Hardin said he'll look into it.

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