The President's resilience and most formidable supporters outrage democrat organ, the hill

By N.S.

"Lt. Gen. Mike Flynn served as Trump’s first national security adviser. He was in office for only 22 days before the ambush."

"The ambush" would have been on february 11, 2017. What "ambush" was committed on february 11, 2017?

https://thehill.com/opinion/campaign/4559868-four-trump-pardoned-allies-thank-him-with-action-and-loyalty/