WASHINGTON D.C.— Michael Flynn, the National Security Advisor to President Donald Trump, has resigned tonight after a controversy as to how much communication he had during the transition with the Russian ambassador about the sanctions that the Obama Administration was about to place on Russia.

The resignation, which was first reported by CNN, is just the latest in a string of controversies that has plagued the Trump Administration in the first few weeks. Other mishaps range from the Immigration ban to discussing a response to a North Korean nuclear test while at a dinner at Trump’s Florida resort over the weekend with Japanese Prime Minister Shinzo Abe.

CNN also reports that Keith Kellogg will be the acting NSA while a search begins for a replacement. Kellogg is a retired lieutenant general in the US Army and was the head of the presidential transition agency transition team for defense.