Trump uses or I should say abuses his Presidency in order to enhance and grow his personal wealth. You want to call that "simply policy actions" be my guest. He just hung a for sale cheap sign out on his Presidency with his MBS and Saudi nonsense. We no longer even have a state to state relationship with Saudi. We have a person to person wealth enhancement relationship between MBS, Donald and his crooked son-in-law Kushner.
Trump's "statement" regarding the entire MBS and Saudi relationship as a consequence of the Khashoggi murder would have been hysterical were it not so sad. The saddest part was Trump trying to hide behind an America first rational which was actually just too absurd. The was not a single word of truth in the entire statement, not about Saudi intentions in Yemen, not about Saudi intended humanitarian efforts, not about the scope and scale of the arms deal with Saudi. It was all self-serving nonsense. Worse it included a bold face lie, bit of propaganda about Khahsoggi that came direct from MBS's regime. It gets pretty bad when the President of the United States is repeating utter lies from the Crown Prince of Saudi. That was nauseating. Since when does US Middle East policy run through Riyadh? Since when is the US suddenly the supplicant and Saudi the client in that relationship? Since Donald, thats when because it suits his and crooked Kushner's personal wealth ambitions. Has nothing to do with what is in the best interests of the USA.
Donald has installed a massively corrupt cabinet to suit his purposes. Zenke will likely be the next to go over corruption charges. Then there are Donald's direct emoluments infringements, likely to get much more of a review than Ivanka's email stuff will get. Donald is probably hoping the Dems waste a bunch of time on Ivanka's email nonsense which by rights should fall to about #1001 on a list of 1000 abuses of power and corruption Oversight investigations.
As for firing Comey, Trump simply screwed himself because he couldn't keep his own big mouth shut. it was not the firing which he was within his rights to do. It was Trump's utter lack of understanding for having to provide a rational for the firing....STUPID Donald STUPID. As for the Rosenstein letter, Trump asked for the letter and Rosenstein complied, not recognizing how the unscrupulous Donald would use the letter.
As for Obama and loyalty, any President wants loyal assistants around him. Trump insists on supplicants and has over time actually removed what few actual just loyal assistants he has had and installed supplicants in their place.