Chicago was one of dozens of cities nationwide that held "No Kings" protests Saturday. A quarter of a million people marched through downtown, organizers said.

The gatherings are part of a mass mobilization across the U.S. and globe positioned as a denouncement of President Donald Trump and his administration’s policies. In Chicago, they come amid sustained immigration raids.

Speaking at a "No Kings" rally in Washington, D.C., Bill Nye, the former host of "Bill Nye the Science Guy," urged lawmakers to “stop the abuses of this petulant president [Trump] and his circle of sycophants,” declaring, “No thrones, no crowns, no kings."

Protesters flooded into streets chanting, marching and waving homemade signs. Organizers said nearly 7 million people showed up for the demonstrations across the country.

Actor John Cusack made headlines in Chicago after delivering a blunt message to President Donald Trump during a “No Kings” protest over the weekend. Speaking with CNN at the event, the longtime Chicago native and outspoken activist didn’t hold back his feelings.

People gathered in Chicago and the suburbs Saturday for a "No Kings" protest amid ongoing federal immigration enforcement operations in the area.

Protesters turned out at roughly 2,700 rallies around the country to celebrate free speech and protest many of the Trump administration's actions.

Thousands of people protested in several dozen "No Kings" rallies across Colorado on Saturday. Denver police say 12 people were arrested near the end or after the Denver rally officially ended.