Bill Turnbull has called out Boris Johnson for sitting next to 95-year-old David Attenborough without wearing a mask at the COP26 UN Climate Summit this week.SEE: Boris Johnson faces backlash for 'not caring' about David Attenborough's health at COP26Bill, who previously hosted on GMB and BBC Breakfast alongside Susanna Reid, as well as Classic FM before he recently stepped down amid his battle with prostate cancer, took to Twitter to share his thoughts on Boris' actions.WATCH: Boris Johnson