Fox News Wednesday notified Tucker Carlson's lawyers that the former prime-time anchor violated his contract with the network when he launched his own Twitter show on Tuesday, according to a copy of a letter obtained by Axios. Why it matters: A breach of contract claim sets Fox News up to explore potential legal action against Carlson, a move that would intensify the already thorny public battle between the two parties. Carlson’s lawyers told Axios that any legal action by Fox would violate his First Amendment rights. “Fox defends its very existence on freedom of speech grounds. Now they want to...