US President Donald Trump fires two impeachment witnesses

US President Donald Trump has dismissed two senior officials who testified against him at his impeachment trial.

Also on the programme: strict quarantine rules have been introduced in Hong Kong to contain the spread of the coronavirus from mainland China, with the threat of jail for anyone who breaches them as the worldwide death toll from the disease passes 700. And: Weekend speaks to the journalist and science writer, Ziya Tong, who is trying to shed light on our failings in her new book The Reality Bubble.

(Photo: Former National Security Council Ukraine expert Lieutenant Colonel Alexander Vindman takes the oath before testifying before the House Intelligence Committee, on Capitol Hill in Washington, DC. Credit: Getty Images)