Operation Warp Speed: How US Covid-19 vaccination plan became politicised

Operation Warp Speed is the name of an ambitious programme put in place by the Trump administration to deliver Covid-19 vaccines across the US. Widely touted during the presidential election campaign and officially rolled out in December, it was supposed to have 20 million people vaccinated by January 1 of this year. But by that date, barely 25 percent of the target had been reached. So what happened? Has the operation fall victim to politicisation? Our Washington correspondents Matthieu Mabin and Fanny Allard report.