Not since his mother has Little Donnie dealt with a woman that he couldn't buy, bully or sue into submission. None of those tactics have any effect on Nancy. He is defenseless, as they are the only tools he possesses. When he threw a tantrum, she refused to give in and took away his favorite toy. When he straightened up, she gave his toy back. At the SOTU, he said something that he hoped would please her. He turned to see if she approved, and she did. Watch his lips, he said "thank you". Going forward, he will be as deferential to her as he is to Putin, and for exactly the same reasons. She holds power over him and he has none. If he is bad, she will spank him with the Constitution. Over and over again until he learns to behave.
Donnie has a new Mommy, and she knows exactly how to handle him.