Two prominent US political commentators who were due to speak at events in the UK this week have said they have been banned from entering the country.Cenk Uygur, the host of the Young Turks online political talkshow, and Hasan Piker, who runs his own hours-long stream each day, said they had been stopped from appearing at SXSW London, while the former claimed also to have been prevented from speaking at an event run by University of Oxford students.View image in fullscreen“I’ve been banned from the UK,” Uygur said on social media. “I tried to get on a flight to London...