Impeach Bush and Cheney Now

At least Nixon had some integrity when he was caught with the Water Gate incident. Now that Bush and Cheney are caught with their pants down, what will they do (again)?

US President George W Bush authorised the leak of secret intelligence to a newspaper to help defend the Iraq war, a former White House aide has said.
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… in the past the president has said he does not approve of such leaks and would sack anyone involved.

How many lies does an administration have to tell for its members to be impeached?