President Donald Trump speaks during a news conference on the North Portico of the White House, Monday, Sept. 7, 2020 (Patrick Semansky/AP Images)

CEOs join reg­u­la­tors and top sci­en­tists vow­ing to hold the line on Covid-19 vac­cine. But will that get in the way of Trump's 'big sur­prise'?

Nine top de­vel­op­ers lead­ing the race to de­vel­op a vac­cine to com­bat Covid-19 are pre­sent­ing a uni­fied front this morn­ing as they joint­ly com­mit …

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