WASHINGTON (CBS/AP) — California Sens. Barbara Boxer and Dianne Feinstein are asking state health officials to reconsider the state’s policy on vaccine exemptions.

In a joint letter, the two Democratic lawmakers say there should be no such thing as a philosophical or personal belief exemption to being vaccinated since everyone uses public spaces.

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Childhood vaccine has become an emotionally charged topic and a national issue amid a measles outbreak that has sickened more than 100 people across the U.S. and in Mexico.

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California is among 20 states that allow for personal belief exemptions and 48 that allow for religious exemptions.

The two senators say they also understand a small number of children cannot be vaccinated because of an underlying medical condition. They stress that the vaccines are effective and necessary.

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