Federal prosecutors are investigating a claim that the pharmaceutical giant Pfizer delayed announcing the success of its COVID-19 vaccine during the pandemic until after the 2020 election.

Soon after President Donald Trump was reelected in November, British drugmaker GSK told federal prosecutors in Manhattan that one of its scientists, who used to work at Pfizer, made the allegation, The Wall Street Journal reported Wednesday, citing people familiar with the matter. It isn’t known what potential violations could be in play.

The scientist now disputes what he told his GSK colleagues, but federal prosecutors in Manhattan are taking a closer look at what GSK shared with them, which could be politically explosive. Trump has claimed for years that Pfizer sat on the positive results of clinical trials, which could have reflected well on his management of the response to the pandemic.

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