House Oversight and Government Reform Committee chairman Darrell Issa subpoenaed Environmental Protection Agency Administrator Gina McCarthy on Friday to produce documents he requested more than six months ago.

Issa, a California Republican, and Sen. David Vitter, R-La., the ranking Republican on the Senate Environment and Public Works Committee, had requested in an April 2013 letter to McCarthy documents and communications between the EPA and the White House concerning the agency's response to several congressional requests.

Issa and Vitter asked for all communications between McCarthy, former administrator Lisa Jackson (under her email alias "Richard Windsor") and other high-ranking EPA officials.

The agency provided a few documents in response to that request, but withheld many more.

“Given the EPA’s continued lack of cooperation, I am left with no choice but to issue a subpoena to compel the production of documents relevant to the committee’s oversight obligations," Issa said in a letter to McCarthy concerning the subpoena.

In the same letter, Issa described evidence that McCarthy's agency had been ready to cooperate with the April request in early June, but held back after consulting with the White House.

The new evidence was centered on an email included in an EPA response to a Freedom of Information Act request from nonprofit watchdog group Cause of Action.

In the June 13 email, EPA Acting Principal Associate General Counsel Kevin Minoli wrote to White House Special Assistant to the President Daniel Dominguez asking for White House input on how the agency should respond to the request from Issa and Vitter.

Go here for more information from the committee on the subpoena.