WASHINGTON, DC - AUGUST 10: Health and Human Services Secretary Robert F. Kennedy Jr. joins U.S. President Donald Trump as he signs an executive order calling for childhood vaccine shots to be spaced out into separate visits during an event in the Oval Office of the White House on August 10, 2026 in Washington, DC. During his second term, Trump has urged Health and Human Services Secretary Robert F. Kennedy Jr. to investigate further research on vaccines. (Photo by Anna Moneymaker/Getty Images)

WASHINGTON, DC - AUGUST 10: Deputy Assistant to the President for Domestic Policy Dr. Heidi Overton (R), accompanied by Health and Human Services Secretary Robert F. Kennedy Jr. (L), speaks in the Oval Office before U.S. President Donald Trump signs an executive order calling for childhood vaccine shots to be spaced out into separate visits at the White House on August 10, 2026 in Washington, DC. During his second term, Trump has urged Health and Human Services Secretary Robert F. Kennedy Jr. to investigate further research on vaccines. (Photo by Anna Moneymaker/Getty Images)

WASHINGTON, DC - AUGUST 10: U.S. President Donald Trump sits after signing an executive order calling for childhood vaccine shots to be spaced out into separate visits during an event in the Oval Office of the White House on August 10, 2026 in Washington, DC. During his second term, Trump has urged Health and Human Services Secretary Robert F. Kennedy Jr. to investigate further research on vaccines. (Photo by Anna Moneymaker/Getty Images)

WASHINGTON, DC - AUGUST 10: National Institutes of Health Director Jay Bhattacharya speaks during an event before U.S. President Donald Trump signs an executive order calling for childhood vaccine shots to be spaced out into separate visits during an event in the Oval Office of the White House on August 10, 2026 in Washington, DC. During his second term, Trump has urged Health and Human Services Secretary Robert F. Kennedy Jr. to investigate further research on vaccines. (Photo by Anna Moneymaker/Getty Images)

WASHINGTON, DC - AUGUST 10: U.S. President Donald Trump holds up a sign that reads "Gold Standard Childhood Vaccine Recommendations" before signing an executive order calling for childhood vaccine shots to be spaced out into separate visits during an event in the Oval Office of the White House on August 10, 2026 in Washington, DC. During his second term, Trump has urged Health and Human Services Secretary Robert F. Kennedy Jr. to investigate further research on vaccines. (Photo by Anna Moneymaker/Getty Images)

WASHINGTON, DC - AUGUST 10: U.S. President Donald Trump (R), accompanied by National Institutes of Health Director Jay Bhattacharya (L), and Jayme Leagh Franklin with the The Conservateur (2nd-L), speaks after signing an executive order calling for childhood vaccine shots to be spaced out into separate visits during an event in the Oval Office of the White House on August 10, 2026 in Washington, DC. During his second term, Trump has urged Health and Human Services Secretary Robert F. Kennedy Jr. to investigate further research on vaccines. (Photo by Anna Moneymaker/Getty Images)

WASHINGTON, DC - AUGUST 10: U.S. President Donald Trump, accompanied by (L-R) White House Deputy Chief of Staff and Homeland Security Advisor Stephen Miller, National Institutes of Health Director Jay Bhattacharya, Jayme Leagh Franklin with the The Conservateur, and Health and Human Services Secretary Robert F. Kennedy Jr., holds up a sign that reads "Gold Standard Childhood Vaccine Recommendations" before signing an executive order calling for childhood vaccine shots to be spaced out into separate visits during an event in the Oval Office of the White House on August 10, 2026 in Washington, DC. During his second term, Trump has urged Health and Human Services Secretary Robert F. Kennedy Jr. to investigate further research on vaccines. (Photo by Anna Moneymaker/Getty Images)

WASHINGTON, DC - AUGUST 10: U.S. President Donald Trump, accompanied by Health and Human Services Secretary Robert F. Kennedy Jr. (R) and Jayme Leagh Franklin with the The Conservateur (L), signs an executive order calling for childhood vaccine shots to be spaced out into separate visits during an event in the Oval Office of the White House on August 10, 2026 in Washington, DC. During his second term, Trump has urged Health and Human Services Secretary Robert F. Kennedy Jr. to investigate further research on vaccines. (Photo by Anna Moneymaker/Getty Images)