Trump’s effort to erase the violent assault has opened up new fronts and skirmishes in Washington’s four-year reckoning with the attack.

Trump’s order said the government would no longer recognize U.S. citizenship if a person was born in the U.S. "when that person’s mother’s presence in the United States was lawful but temporary, and the person’s father was not a United States citizen or lawful permanent resident at the time of said person’s birth."

U.S. health agencies including the CDC this week canceled meetings with external groups, paused some public health publications and told employees to freeze travel after directives from the Department of Health and Human Services,