The move comes less than a week after the former deputy secretary of state acknowledged that he was the long-undisclosed source in an op-ed piece by columnist Robert Novak.
Novak published Plame’s name in July 2003 after her husband, former U.S. Ambassador Joseph Wilson, raised questions about a key element of the Bush administration’s justification for going to war in Iraq — that Iraq was seeking to buy uranium in the central African nation of Niger.
The article set off a lengthy federal investigation that eventually ensnared Vice President Dick Cheney’s then-chief of staff Lewis “Scooter” Libby, who has been charged with perjury, obstruction of justice and lying to investigators about his discussions with journalists about Plame.
Libby has denied wrongdoing and has pleaded not guilty.
Armitage’s disclosure — which he says was unintentional — violated Plame’s privacy and ruined her career, court papers said, but Armitage was not included in the conspiracy accusations being leveled against Cheney, Libby and Karl Rove, President Bush’s top political adviser.