Josh Paul worked in the same State Dept. office throughout the international catastrophe of Trump's presidency. He was there for the "peace plan" written by Jared Kushner (a failed mobster from New Jersey with no diplomatic experience), which was such an obscene insult to Palestinians that it may have ruined the US' ability to broker Mideast peace forever.
Did he resign then? No. He waited to flounce off until he could attack Biden.
And that's what HuffPo wrote an article about.