We can begin with this laundry list from day 1 of his term in office.
President Trump’s Lies, the Definitive List
I am as frustrated with my Trump friends as I was with my Obama friends the past 8 years. You can be loyal to "your guy" and still admit that not every decision and statement is brilliant.
With Trump, even more than Obama, there is a direct analogy to the "Emperor Has No Clothes". I can point you to a very popular and well-run gun board where the site owner will literally ban members who dare speak out against some of the decisions/statement Trump has made.
At some point we conservatives and Republicans have to get past the "he beat Hillary" mantra, stop being sycophants, and hold our President accountable.