Well, let me see. Congress has the power to regulate commerce among the several states.
Nope, I see no restrictions there, other than the fact that Congress is responsible to the voters who put them there and may just as easily remove them.
Your grammatical error is revealing, since you have endorsed the position that Congress has the legal right to order the extermination of some, or all, of the population.
Obviously, a position that leads to so absurd a conclusion is without merit.