In a contentious Senate hearing marked by raised voices and heated exchanges, Health and Human Services Secretary Robert F. Kennedy Jr. faced calls to resign from Democrats and unexpected criticism from Republicans.

Several Republican senators brought up the legacy of President Donald Trump's Operation Warp Speed, which sent a safe COVID vaccine to the public in record time, helping save millions of lives. They pushed Kennedy to explain his current approach to the shots and mRNA technology.

Kennedy has enacted policies that cancelled hundreds of millions of dollars in research funding on mRNA technology for future vaccines, and under his leadership the Food and Drug Administration limited access to the COVID shots, saying only people at high risk of complications from COVID or those over

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