Pentagon Policy Official Resigns At President Trump's Request

John Rood, a Pentagon official, resigned reportedly at President Trump's request. His resignation letter, obtained by CNN, indicated that Secretary Mark Esper communicated the request. Rood, who joined in 2018, was responsible for defense policies and coordination with US allies. His departure follows disagreements with the Trump administration on issues like Ukraine. Trump confirmed the resignation on Twitter, thanking Rood for his service. Rood will officially leave on February 28th.

Who was the Secretary that informed Rood about the request for his resignation?

What did President Trump say about John Rood's service?