Correction, CEO.

Things are facts if they are backed up by laws, treaties and agreements. POTUS cannot make those up on a whim.
A National Security Advisor is partly there to provide guidance with that.

This whole discussion is a case against the POTUS.

Another copy/paste:

Irrelevant.

copy/paste of another reply:

So you think that a broker of policy options for the President shouldn’t correct him when he makes a big mistake?

Honest.

He can, but it is still your job to provide facts.

democracy

read my other replies.

honest broker of policy options

read my other reply with a quote on what does National Security Adviser do, posted twice.

A copy/paste of my other reply:

Given that the US is a democratic state, and McMaster is working as part of it’s government, it is his duty to provide opinions even if they undermine the POTUS.

Isn’t that the whole point of democracy, if your boss is acting like a tool?

McMaster and Mattis should organise a coup, install a military junta as a preparation for the Nixon 2020.