evidence: The executives — Gorsky, Pfizer CEO Albert Bourla and Moderna President Stephen Hoge — spoke in an exclusive joint interview with NBC News' Lester Holt. The interview is scheduled to air Thursday on "Dateline NBC" at 10 p.m. ET. [...] Bourla said researchers and regulators ought to find a way to quickly vaccinate participants in clinical trials who received placebo doses, an idea Pfizer said it was exploring last month. "It is a moral and ethical dilemma and obligation, I think, that we have to these people," he said.