1. Attacking the free press and mainstream media as fake news even when reporting was accurate and truthful.
2. Attacking law enforcement, simply because their activity interfered with his goals of having them distrusted, just because he likes breaking the laws of the land with impunity.
3. Attacking the courts and validity of the judges and juries, including judgements made by Trump appointed judges, ruling like all other judges when his legal/illegal claims were refuted or the courts acted in ways, not to his benefit. These things done to invalidate the legal system in the eyes of his mindless minority follower.
4. His policy that it is OK to overthrow the elections by the people of the US, simply to hold on to power, knowing his own people informed him, he lost the election.
These are just a few. I am surprised you had to ask. Everybody knows these and other policy/policy like moves of him and his supporters controlled by him.