Health Secretary Robert F. Kennedy Jr., his son, and Senator Rand Paul have all written books criticizing Dr. Anthony S. Fauci. All were published by a company led by a close Kennedy adviser.

© Haiyun Jiang/The New York Times

Senator Rand Paul said the committee he leads would vote next week on whether to hold Dr. Fauci in contempt of Congress.

© Haiyun Jiang/The New York Times

Diary entries, released by a Republican senator, have reignited a furious debate over whether Covid-19 leaked from a lab.

© Stefani Reynolds for The New York Times

Michael Kratsios, President Trump’s science adviser, proposed overhauling how the government funds research. Democrats said Mr. Trump’s actions had weakened science.

© Eric Lee/Reuters