Attacking the media, contradicting science, spreading misinformation, seizing power from congress...
How is Trump seizing power from Congress? The senate has full authority to block a vote on a nominee if they please. Democrats have threatened to pack the courts if they don't get what they want here, which is basically seizing power from congress so judges can legislate from the bench.
I wasn't referring to the recent SCOTUS news.
Some examples of things he's done to weaken the legislative branch and increase the executive banch:
-Diverted military funding to pay for the border wall without congressional approval.
-Withheld funds that congress had already signed off on to help Ukraine in order to pressure the Ukrainian president to publicly announce an investigation into Biden.
-Refuses to allow House leaders to be briefed on military strikes or potential military strikes - I think he said something like 'my tweets are your briefing'.
I don't disagree with you on the border wall funding. He had the legal authority to divert funding for national security, but obviously illegal immigration isn't a national security threat, fair criticism.
Your other two examples are more nuanced. If we're talking about precedent, Obama routinely started military conflicts without congressional approval. It isn't necessarily a Trump thing. The power of the executive has grown exponentially.