Obama's Executive Order

In Obama's speech on illegal immigration, he said he would be taking actions through executive orders., because congress hasn't passed any bills and he wanted to get things done.  The thing is, HE CAN'T DO THAT.  No where in the constitution does it state that he can allow 5 million undocumented immigrants to stay, come out of the shadows and get right with the law.  He doesn't have that power and it is not stated anywhere in the constitution.  It's vital that this doesn't go through and that he looses in court, because if he starts doing what ever he wants that can lead to huge problems and even a dictatorship.  This is not what the founding fathers had in mind and in their plans.