McClellan tells CBS News White House correspondent Bill Plante, "I have accepted. I am happy to share what I know."
House Judiciary Committee chairman John Conyers, D-Mich, asked McClellan to testify after he claimed in his new book: "What Happened: Inside the Bush White House and Washington's Culture of Deception" that he was mislead about Scooter Libby's role in the leak by Vice President Dick Cheney and others in the Bush Administration.
McClellan's book has caused quite the stir inside the Beltway and in the media. McClellan spoke with Katie at the beginning of his book release frenzy about his time in the White House Press office - and what he knew during "Plame-gate." You can watch their interview by clicking here.
Conyers asked McClellan to testify next Friday, June 20.
Of course, a few more questions remain. Will President Bush – if he is able to – exert executive privilege to stop his former spokesman's testimony? Will McClellan say anything he hasn't already gone over in his book? We'll be on top of the story – so check back to stay up on the latest.