A nonprofit anti-vaccine group founded by Robert F. Kennedy Jr. said it is funding a lawsuit against him, in his capacity as secretary of the US Department of Health and Human Services, for failing to establish a task force to promote the development of safer childhood vaccines.

Children's Health Defense, an anti-vaccine group Kennedy founded, had pushed through to bring the task force back.

The U.S. Department of Health and Human Services said on Thursday it is reinstating a federal task force for safer childhood vaccines after 27 years.