A top spokesman in the U.S. Department of Health and Human Services abruptly resigned over reports of internal clashing over management and escalating health emergencies.

Kennedy wrote in an opinion piece published Sunday on Fox News Digital that parents should consult with physicians about the MMR vaccine.

But in his new opinion piece about the ongoing measles outbreak, published March 2 in Fox News, Kennedy wrote that vaccines “not only protect individual children from measles, but also contribute to community immunity,