grounds for impeachment

If this president vetoes the defense bill with McCain's detainee clause.

here's the white house's phony, dispicable position:

Bush administration officials say the provision would limit the president’s authority and flexibility, and the White House says advisers would recommend a veto of the entire spending bill if it includes provisions that would hurt efforts in the war on terror.
White House spokesman Scott McClellan said Thursday that some of the wording about detainees was unnecessary and duplicative, and that the administration hoped to press the concerns with congressional negotiators.