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

I want to construct an essay based on 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). There needs to be an emphasis on how his actions challenges limits of executive power (continuous reference to the vesting clause in relation to Trump). 

The paper must be 5 pages (times new roman, 12 font, double spaced) and analytical. The paper needs to include 3 or more academic sources. 

Included below are the requirements set by my professor.