Republican Senator Marco Rubio has been leading in Florida’s U.S. Senate race, but new polls show the race may now be too close to call. Regan McCarthy has more. Republican presidential candidate Donald Trump is refusing to say he’ll honor the results of the November 8 th election. Politicos and historians alike say the statement undermines integral American institutions like credible democracy and peaceful transitions of power. Kate Payne looks at what Trump’s remarks mean for elections