And Conservative MP Peter Bone, who sits on the panel, decried the move as "a stitch-up", claiming it was an attempt by the executive "to ignore Parliament and impose its will on the House".
Seattle showed that it is no longer acceptable for rich countries to stitchup trade deals among themselves and expect developing countries to concur without being involved in a meaningful way.
But Conservative leader David Cameron warned against "an establishment stitch-up", while the Lib Dems have threatened to boycott the inquiry if it is held in private.