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Kseniia Petrova, a Harvard researcher, was detained in February after failing to declare scientific samples she was carrying into the country.

The directive, in a memo issued Tuesday, came after two court rulings that questioned the Trump administration's swift cuts to funding.

In a video address, the health secretary said the United States would no longer donate to Gavi, the vaccine agency. The organization rejected his claims.

The panelists will review measles vaccine recommendations and discuss a preservative that the health secretary has falsely claimed causes autism.

Hints of a more skeptical approach to immunizations have already surfaced.

A new drug that gives almost complete protection against the virus was to be administered across Africa this year. Now, much of the funding for that effort is gone.

The administration has gutted agencies like U.S.A.I.D., and President Trump has denigrated their work as wasteful and rife with fraud. His views on humanitarian assistance have seesawed since he entered political life.

Health Secretary Robert F. Kennedy Jr. fired all 17 members of the panel and appointed eight new ones. Now, the board is down to just seven.

The Senate health committee chairman said new members of a key advisory panel who were appointed by Robert F. Kennedy Jr. "lack experience."

Temperatures in Central Park are forecast to soar into the high 90s on Monday and Tuesday, but it will feel like it's 105 degrees outside.