When it comes to Leadership all eyes are on the President.
The President of the US is the number one leader in the free world, President Trump’s comments in the public forum are terrible.
As a leader and manager, if you’re not happy with an employee (Jeff Sessions, for example) meet with them and communicate your issues. Then ask the employee if he or she has any comments and come to an understanding on future performance.
If this does not work then you can make a change but never ever embarrass an employee and especially in a public forum. The President has quite a bit to learn as it relates to leadership.