The Arizona Cardinals are apologizing to one of their fans and season ticket holders ... after the woman was forced to throw away her MAGA hat, or risk missing Sunday's game.
The controversial incident went down before the Rams vs. Cardinals game at State Farm Stadium in Glendale ... when Susan Rosener, who was with her husband, was stopped at a checkpoint.
Stadium security informed Rosener she couldn't enter due to her "Make America Great Again" hat, Donald Trump's famous slogan.