Watch why Donald Trump slammed Covid vaccine breakthrough claim by Pfizer

Donald Trump, the outgoing President of the United States of America, criticised pharma major Pfizer a day after it announced a breakthrough in its research to find a vaccine for Covid-19. The latter claimed that the vaccine it developed with BioNTech showed 90% effectiveness in preventing infection as per a study of initial evidence in the ongoing Phase 3 trial. Trump questioned the timing of the announcement, linking it to the recent US Presidential election which he lost to the Democratic party's Joe Biden. Trump said that the US Food & Drug Administration (FDA) and the Democratic party were behind the announcement being made after the US elections. Meanwhile, experts warned that the progress made by Pfizer was only one of the first steps in the mission to inoculate people to defeat Covid. Watch the full video for more.