Coronavirus live news: Singapore bans entry or transit from UK; Trump threatens not to sign Covid aid bill

California has recorded a half-million coronavirus cases in the last two weeks. Photograph: Renée C Byer/AP

source https://www.theguardian.com/world/live/2020/dec/23/coronavirus-live-news-us-cases-increase-14-in-one-week-france-to-reopen-uk-border