Former White House Press Secretary Scott McClellan said Friday that he would be willing to comply with a possible congressional subpoena to discuss the administration's handling of prewar intelligence, telling CNN's Wolf Blitzer he'd be "happy to talk if I am asked to testify."

Rep. Robert Wexler, D-Florida, said Friday that McClellan, who left the White House in 2006, would be able to provide valuable insight into a number of issues under investigation by the House Judiciary Committee.

The committee is looking into the use of prewar intelligence, whether politics was behind the firing of eight U.S. attorneys in 2006 and the leaking of CIA operative Valerie Plame Wilson's identity, Wexler, a senior member of the Judiciary Committee, said.

In the book, McClellan says President Bush told him he had authorized the leaking of Plame Wilson's identity to the press.

Facing a firestorm over his book, McClellan also confirmed reports Friday that he apologized to Richard Clarke for questioning his honesty after the former counterterrorism official published his own book critical of the White House.

"I had not read his book; I was just reading talking points," McClellan admitted Friday. "It was a very tough process to come to these conclusions. It was vital to write these things in order to get them out."