WASHINGTON – President Donald Trump said Sept. 1 he is now demanding that COVID-19 vaccine manufacturers prove that their shots have been effective, adding to his long string of comments alternately praising − and doubting the effectiveness − of the potentially life-saving medication.

Trump called on drug companies to "justify their success" in combating the COVID-19 virus, demanding the immediate release of data on the matter.

"Many people think they are a miracle that saved Millions of lives. Others disagree!" Trump said of COVID-19 drugs, including vaccines made by Pfizer, Moderna and other pharmaceutical companies. "With CDC being ripped apart over this question, I want the answer, and I want it NOW."

Trump said he wants the CDC to release numbers and results "NOW" to "clear up this MESS, one way or the other!!!"

Trump and his administration appear to be far less supportive of Covid-19 vaccines than during Trump's first term, when he championed the "Operation Warp Speed" campaign to develop safe and effective shots for the pandemic that originated in Wuhan, China in late 2019.