Certainty has been the condition of the evening programs on Fox News for a generation, but on Tucker Carlson’s show on Wednesday night, which aired just a few hours after the Justice Department announced it had appointed a special counsel to oversee the investigation of possible links between Donald Trump’s Presidential campaign and Russia, doubt crept onto the screen. Kellyanne Conway, Trump’s counsellor, had been scheduled to appear on the show, Carlson told his audience, but the White House had cancelled shortly before broadcast, without giving much of an explanation. “It does seem a little chaotic over there,” Carlson observed. To replace Conway, he had invited Matthew Schlapp, the President of the American Conservative Union and a Trump ally, who had been to the White House earlier in the day, and who said the atmosphere there had been tense. “There really is nothing more stressful in life than being investigated,” Schlapp said. Carlson agreed.