Several million people plan to participate in more than 2,500 "No Kings" rallies throughout the U.S. in what organizers bill as the largest single-day protest.

Advocacy groups prepare for the "No Kings" rallies in the U.S., calling for government accountability and public vigilance under the Trump administration.

More than 2,500 protests against the administration are expected on Oct. 18. Organizers expect it to be the largest day of protest in U.S. history.