The father of the 20-year-old Ohio man accused of plotting an attack on the U.S. Capitol building told NBC News on Thursday that he believes his son was coerced by an FBI "snitch" and never could have carried out the attack on his own. Christopher Lee Cornell, 20, was arrested Wednesday after he bought two M-15 semi-automatic rifles and about 600 rounds of ammunition as an undercover operative watched, according to an FBI affidavit. Cornell's father, John, said that his son is quiet, shy and has never fired a gun before. He also said that his son's "best friend is a kitty cat" and that he was lost and vulnerable. "I think a lot of it was coercion. I think he got coerced," John Cornell said.