The chief scientist brought on to lead the Trump administration’s vaccine efforts has spent the last several days trying to disentangle pieces of his stock portfolio and his intricate ties to big pharmaceutical interests, as critics point to the potential for significant conflicts of interest.

The scientist, Moncef Slaoui, is a venture capitalist and a former longtime executive at GlaxoSmithKline. Most recently, he sat on the board of Moderna, a Cambridge, Mass., biotechnology firm with a $30 billion valuation that is pursuing a coronavirus vaccine. He resigned when President Trump named him last Thursday to the new post as chief adviser for Operation Warp Speed, the federal drive for coronavirus vaccines and treatments.

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