WASHINGTON — President Trump on Monday suggested an overhaul to how children get vaccinated after claiming, without evidence, that many vaccines are unsafe as currently given. The president said he has talked with health secretary Robert F. Kennedy Jr. about his proposed changes.

While Trump has occasionally expressed skepticism of some vaccines, the president’s comments were his most extensive and detailed yet about his doubts and plans for action. They came during a White House event on the rise in cases of autism among children , a cause that Trump and Kennedy have zeroed in on.

The extraordinary remarks included Trump suggesting changes to how many shots children get and the time periods over which they get them. The president did not provide any evidence to support changes — inste

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