India, Sept. 21 -- Republican Senator Bill Cassidy of Louisiana publicly urged US President Donald Trump on Sunday to exercise "radical honesty" when discussing vaccine safety, directly challenging the US president's assertion that the measles, mumps and rubella vaccine is potentially lethal.

Cassidy's intervention, delivered on CBS News' "Face the Nation with Margaret Brennan," comes as the United States confronts its most severe measles outbreak in more than thirty years, with recent deaths among teenagers and middle-aged adults underscoring the disease's capacity to inflict lethal consequences upon unvaccinated populations.

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