The head of the U.S. The Food and Drug Administration says efforts to distribute the nation's first COVID-19 vaccine are underway. "With this authorization, we know that our federal partners are already moving to distribute the first doses of the vaccine throughout the country," FDA Commissioner Stephen Hahn told reporters in an online news conference Saturday. The U.S. on Friday gave the final go-ahead to the vaccine from Pfizer and its German partner BioNTech. Hahn says the vaccine is safe and strongly protective. While the FDA decision came only after public review of data from a huge ongoing study, it also has been dogged by intense political pressure from the Trump administration, which has accused the agency of being too slow and even threatened to remove Hahn if a ruling did not come Friday. "The representations in the press that I was threatened to be fired if we didn't get it done by a certain date is inaccurate," he said.