Muhammad Bazmūl حفظه الله said, “Preference to Pray Sunnah of Fajr (if you missed it) is after Sunrise based on the Prophetic narrations.”
[Taken from the lessons on “Conditions, Pillars and Obligation of Salah – Shaykh ul Islaam Muhammad bin Abdil Wahhab رحمه الله Explanation by Shaykh Abdul Muhsin al-Abbaad حفظه الله Taught by: Abdulilah Lahmami]