It's worth noting that Trump has claimed to have authority over a lot of things that were previously considered under the control of the Senate and Congress, or at least something that they had a say in. However, the current Senate and Congress for some reason have not stepped in to tell Trump that he doesn't have full/any authority over those things. That will almost certainly change when the new batch of legislators is sworn in, so there will be at least some additional restrictions on Trump in the sense that some of the restrictions he should have already been subject to will finally be applied.