Democratic Sen. Elizabeth Warren is pressing the CEO of a major pharmaceutical trade group on its lobbying efforts against a proposal to waive intellectual property rights for Covid-19 vaccines that would help boost production of the shots for poorer nations.

Warren and other lawmakers asked how much money the Pharmaceutical Research and Manufacturers of America, or PhRMA, and its member companies spent this year lobbying Congress and White House officials in opposition to the waiver, in a letter sent Wednesday to PhRMA CEO Stephen Ubl that was obtained by CNBC.

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