Phoenix's "No Kings Day" rally against President Trump, one of many nationwide, coincided with his 79th birthday and military parade in Washington, D.C.

Across the country, an estimated 5 million protesters took part in more than 2,000 protests, according to the American Civil Liberties Union, a co-sponsor of the nationwide protest. In the Bay Area, more than 50 protests were planned stretching south from Gilroy north to Santa Rosa.

Thousands marched and rallied peacefully during the No Kings OKC protest on June 14, the same day as the U.S. Army 250th Anniversary military parade.

Police are investigating a shooting at a protest in Salt Lake City, in which a bystander was killed. A man was charged after driving through a crowd in Culpeper, Va.

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.

We implore everyone not to play into Trump’s hands and fall for his schemes,” the chair of the Washington State Democratic Party said in a statement.

The "No Kings Nationwide Day of Defiance" is planned to "reject corrupt, authoritarian politics in the United States," organizers say.

A bystander was fatally shot after security members at the demonstration confronted a man who was running toward the crowd with an AR-15-style rifle, the police said.

NBC News' Jacob Soboroff reports from Los Angeles City Hall where thousands of protesters have gathered for a 'No Kings' protest against the Trump administration and ahead of the president's Washington D.