"In America, we don't do kings," the No Kings website reads. "They've defied our courts, deported Americans, disappeared people off the streets, attacked our civil rights, and slashed our services. The corruption has gone too. far. [cq] No thrones. No crowns. No kings."

The rallies were among hundreds of "No Kings" protests held throughout the United States, timed to coincide with a military parade celebrating the 250th birthday of the U.S. Army in Washington, D.C. Saturday was also Trump's 79th birthday.

"We expect all participants to seek to de-escalate any potential confrontation with those who disagree with our values and to act lawfully at these events..."

Millions of people across the country are expected to join in protest this weekend against Donald Trump’s administration, a movement intended to coincide with the president’s planned military parade in Washington.

In New York City, the biggest "No Kings" demonstration began at Bryant Park on Saturday before moving down Fifth Avenue to Madison Square Park.

Democracy is “in real trouble,” Mark Ruffalo told MSNBC’s Antonio Hylton while attending the “No Kings” rally in New York City Saturday. His words were echoed by Ellen Pompeo, Kerry Washington, Jimmy Kimmel, and many more notable people and celebrities who spoke out in support of the nationwide protests.

Cities large and small across the U.S. saw crowds gather Saturday for planned "No Kings" protests against President Trump.

The No Kings Day of Defiance protests will happen during the military parade in Washington on Saturday for the Army’s 250th anniversary — which coincides with Trump’s birthday.

The First Amendment of the U.S. Constitution and Article I Section 8 of the New York State Constitution protects freedom of speech, assembly, and petition. While not an exhaustive list, here are a few rules New York protestors must follow, according to the NYCLU:

Over 90 "No Kings" protests were taking place Saturday, June 14, across New York state as millions across the country are expected to take part in a "nationwide day of defiance."

Saturday marks the first full day of Marines on duty in Los Angeles, one week after protests against Immigration and Customs Enforcement raids ignited in LA and spread to other cities across the U.S.,