President Donald Trump’s pick to lead the National Institutes of Health answered sharp questions in a confirmation hearing Wednesday about his views on vaccines, research funding and the role scientists should play in a pandemic.

Bhattacharya became a plaintiff in a Supreme Court case, Murthy v. Missouri, arguing he was “unfairly censored” on social media as part of government efforts to combat misinformation. While the case gained national attention, it was ultimately unsuccessful in a 6-3 ruling.

Bhattacharya is a professor of health policy and economics at Stanford University who rose to prominence as a skeptic of lockdowns and mask mandates amid the COVID-19 pandemic.