NEW: Secretary of State Marco Rubio smacks down CBS News' Margaret Brennan after she bizarrely claimed the Holocaust happened because of too much free speech.

Brennan verbally struggled as she tried relating JD Vance's comments on free speech to Nazis.

Brennan: "[Vance] was standing in a country where free speech was weaponized to conduct a genocide..."

Rubio: "I have to disagree with you. Free speech was not used to conduct a genocide."

"The genocide was conducted by an authoritarian Nazi regime that happened to also be genocidal because they hated Jews... There was no free speech in Nazi Germany. There was none."