While I agree with you in theory, I wonder that in practice this may not pan out. Though, I don't know the differences in precident for DC courts in relation to the rest of the US. If, in the past, rulings in DC were held up in the US, then the precident is that he cannot get away with it. If legally DC has been established to have limited powers as you claim, AND US courts can show evidence where this is the case, then I would agree with you in practice.
While I agree with you in theory, I wonder that in practice this may not pan out. Though, I don't know the differences in precident for DC courts in relation to the rest of the US. If, in the past, rulings in DC were held up in the US, then the precident is that he cannot get away with it. If legally DC has been established to have limited powers as you claim, AND US courts can show evidence where this is the case, then I would agree with you in practice.