(NBC News) — The head of Pfizer, one of the drugmakers racing to develop a coronavirus vaccine, told employees he was disappointed that its work was politicized during this week’s presidential debate and tried to reassure U.S. staff that the company won’t bend to pressure to move more quickly.

Chief Executive Officer Albert Bourla told the employees Thursday that the company is “moving at the speed of science,” rather than under any political timing, according to a staff letter obtained by The Associated Press.

“The only pressure we feel — and it weighs heavy — are the billions of people, millions of businesses and hundreds of government officials that are depending on us,” Bourla wrote.

Despite top U.S. federal health officials repeatedly stating that a vaccine is unlikely to be available widely until 2021, President Donald Trump has insisted that a vaccine will be ready before Election Day.

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