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Several members of Congress, such as Rush Holt, have called on Obama not to wait for Congress to act and, instead, to immediately issue an Executive Order compelling government-wide compliance with the Army Field Manual. Obama should do that. But, as Holt recognizes, this is really an area where Congress can and must legislate.
How could Obama do that when he's not president yet? Unless you mean immediately after he is inaugurated, then we will then have no choice but to wait...