Brian Townsend teaches humanities at Parowan High School in Parowan, Utah
Iron County School District investigating him for tweet he posted on February 13
He called for deaths of GOP senators next time president incites riot at Capitol
Townsend posted tweet same day Senate voted to acquit Donald Trump
Seven Republicans, including Mitt Romney of Utah, voted to convict Trump
Townsend s tweet was posted on Facebook by a parent of one of his students