Who is Joe Kent, and why did he resign as Trump’s counterterrorism chief? - Al Jazeera

I don't have the article excerpt needed to write this summary accurately. The headline tells me Joe Kent resigned as Trump's counterterrorism chief, but I need the body text to identify his specific role, the stated reason for his resignation, and any details about the circumstances or consequences. To write a proper brief, I need you to provide the excerpt from the Al Jazeera article. Once you do, I'll deliver a sharp 3-5 sentence summary with the facts grounded directly in what the article says.