The Arizona lawmaker sent a letter to Obama on Monday complaining that Congress cannot tell the American people what its government is doing if the administration creates a "secret alternate communications network." McCain said the administration's actions are undermining congressional oversight.
He asked the administration to respond to several questions by July 1.
The Associated Press reported earlier this month that officials are using the secret email accounts, making it difficult to respond to requests for public records and answer congressional inquiries.
The White House subsequently acknowledged the practice. Spokesman Jay Carney said all email accounts, public and otherwise, were subject congressional oversight.
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