The White House has refused to turn over subpoenaed documents to Congress as well as refused to allow Harriet Miers and former political director Sara Taylor to testify before Congress under the subpoena.
President Bush is able to refuse such a subpoena due to the seperation of powers (or the White House's interpretation of it) and maintain that refusal based on Executive Privilege. Congress is able to press the issue in Federal Court due to their interpretation of the seperation of powers.
The White House has made some concessions to Congress concerning this issue but Congress refused to accept what was offered as it does not appear to be a legitimate compromise.
You can read more here.
-What are your thoughts on the Executive Privilege?
-What are your thoughts on the seperation of powers?
-Do you think that this issue should be fought out until Congress gets its way? If so, what do you think this will do to the seperation of powers statute?