A Republican senator was sent scurrying away from his own news interview outside the Supreme Court Thursday when an anti-Donald Trump protester decided to explain, quite loudly, her understanding of the word “insurrection.” The angry protester slapped back at Sen. Roger Marshall (R-KS) after he spoke out in support of Trump — whose eligibility to appear on presidential ballots was being argued before the nation’s highest court — and tried to compare the riots on the U.S. Capitol on Jan. 6, 2021, to migrants who daily cross the southern border. “Why wouldn’t we call 10 million people crossing t…