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http://law.justia.com/us/codes/title28/28usc1365.html
The United States District Court for the District of Columbia shall have original jurisdiction ... over any civil action brought by the Senate ... to prevent a threatened refusal or failure to comply with, any subpena ...
... This section shall not apply to ... an officer or employee of the executive branch ...
http://judiciary.senate.gov/oldsite/5182000_pjl8.htm
Statement of Senator Patrick Leahy
May 18, 2000"The civil contempt mechanism normally available to Congress under 28 U.S.C. § 1365 specifically exempts subpoenas to the executive branch."
- - Senator Patrick Leahy
Is there some other way to bring a civil case of contempt?