How has President Trump abused executive power granted to him by the vesting clause?

I want to construct an essay based on the Trump's presidency and three instances where he abused his power. These are: his attempt to subvert the 2020 election, his politicisation of the department of Justice, and his handling of foreign affairs (with Ukraine, North Korea etc). 

The paper must be 5 pages (times new roman, 12 font, double spaced) and analytical. It requires 3 or amere ademic sources, cited in APA. c