President Obama's attorney sent a letter to Congressional investigators on Friday, saying the White House would not cooperate with a subpoena requesting documents related to its doling out a $535 million loan guarantee to now bankrupt solar panel manufacturer Solyndra.

"I can only conclude that your decision to issue a subpoena, authorized by a party-line vote, was driven more by partisan politics than a legitimate effort to conduct a responsible investigation," Obama's counsel, Kathryn Ruemmler, wrote in a letter to the top Republicans on the House Energy and Commerce committee.