https://www.vanityfair.com/news/2018/03/trump-is-going-for-a-clean-reset
A Republican in frequent contact with the White House told me Trump is “frustrated by all these people telling him what to do.”
With the departures of Hope Hicks and Gary Cohn, the Trump presidency is entering a new phase—one in which Trump is feeling liberated to act on his impulses. “Trump is in command. He’s been in the job more than a year now. He knows how the levers of power work. He doesn’t give a fuck,” the Republican said. Trump’s decision to circumvent the policy process and impose tariffs on imported steel and aluminum reflects his emboldened desire to follow his impulses and defy his advisers.