The 'Hardball' host made the shock announcement on Monday night, after more than 20 years at the network. MSNBC host Chris Matthews announced his retirement from the network on Monday night after more than 20 years at the left-leaning cable channel. He will be replaced at 7 p.m. by a rotating group of hosts. While Matthews was expected to retire in the near future, the sudden announcement comes amid of a series of recent flaps and controversies. Last Monday, Matthews apologized to Bernie Sanders for comparing his rise in the 2020 campaign to the German invasion of France. "Let me...