What is his main argument? That's a 1 hour video.
The pro-Trump is based on 4 years of facts. The against-Trump argument is all based on assumptions.
Example:
Fact: Trump said he wants to stop migrants. He's said it over and over.
Fact: Trump built a large portion of the wall, but Congress stopped him from finishing it.
Those who are 'against' Trump would say "he's lying". Ok, maybe he is, but it's unproven. The only thing we know for certain is he took concrete steps to stop migrants. That can't be denied.
If you truly believe he's lying, there's nothing anyone can do to prove or disprove a negative. He could still be lying and you could be right, but we don't know at this point.