Tillerson had a different management style than the majority of the Trump Team. It’s also been clear that he has not been happy in this position. Many times, the president would make decisions without including his SOS in the loop. So, this is not a complete surprise. I hope McMaster goes next.
What has McMaster done that you don’t approve of?
Sessions before McMaster.
I found it interesting that McMaster's South Korean counterpart -- in his announcement that KJU has asked to meet with Trump -- referred to him as, "My good friend, General McMaster"...