Donald Trump's favored coronavirus advisors who sparked controversy over his comments against mask-wearing and other issues has resigned, US media reported Monday.Fox News obtained the resignation letter dated December 1 for Scott Atlas, who lacked relevant experience or qualifications in public health or infectious disease.The outlet also reported that Atlas's contract was already set to expire later this week."I am writing to resign from my position as special advisor to the president of the United States," Atlas said in his resignation letter.He thanked Trump for the honor and wished "all the best" to President-elect Joe Biden's incoming administration."I worked hard with a singular focus -- to save lives and help Americans through this.