Tucker Carlson will relaunch his show on Twitter after being abruptly taken off air by Fox News in April. But who is Tucker Carlson - and why has he been called the "most powerful conservative in America"? Tucker Carlson Tonight Carlson took up the prime-time weekday evenings spot on Fox News in 2016 and quickly established himself as a key player in the network and an influential voice in Republican politics. The show was the highest-rated cable news programme in the key 25 to 54 age demographic, with Fox News the most-watched US cable news network. Ratings have slumped since...