The protests marked the largest outpouring of opposition to Trump’s presidency since he returned to power in January, and came the same day that thousands of military personnel, vehicles and aircraft will march through and fly over Washington, DC, in a parade celebrating the US army’s 250th anniversary.
Yesterday was also Trump’s 79th birthday.
National guard troops and US marines are also in Los Angeles, having been ordered there by Trump to secure the heavily Democratic city amid protests over his immigration policies – a deployment that California governor Gavin Newsom has challenged in court.
Meanwhile, Israel yesterday pounded Iran with a second barrage of strikes in a bid to destroy its nuclear programme after Iran retaliated with strikes the evening before, stoking fears of a mushrooming conflict between the two nations.
Anti-Trump groups planned nearly 2,000 demonstrations across the country to coincide with the parade.
Many are taking place under the theme “No Kings”, asserting that no individual is above the law.
All planned “No Kings” protests in Minnesota were cancelled following what Democratic Minnesota governor Tim Walz said was the “politically motivated assassination” of one Democratic lawmaker and wounding of a second.
Authorities in Minnesota said that flyers promoting the protests were found in the suspected gunman’s car.
A massive manhunt was underway.
Trump condemned the shootings, saying in a social media post: “Such horrific violence will not be tolerated in the United States of America.”
The Texas department of public safety said in a statement it had identified a credible threat against state lawmakers planning to attend a protest yesterday, and had evacuated the state capitol and its grounds.
People in Washington for the parade encountered a massive security presence, with some 30km of 2.4m-high black fencing, much of it reinforced with concrete traffic barriers, cordoning off streets and surrounding landmarks including the Washington Monument.
The celebrations will cost the US army between US$25 million and US$45 million, US officials have told Reuters.
That includes the parade itself as well as the cost of moving equipment and housing and feeding the troops.
Critics have called the parade an authoritarian display of power that is wasteful, especially given Trump has said he wants to slash costs throughout the federal government.
‘Disgusting display’
In downtown Los Angeles, several thousand protesters began marching, packed shoulder to shoulder and stretching along nearly a dozen city blocks.
The protest was peaceful at midday.
American flags, many flown upside down, far outnumbered the Mexican flags at the rally.
Erika Rice, 46, said she was moved to attend her first protest because of Trump’s decision to use the military to assist ICE on immigration raids and to protect federal buildings in her city.
“Using the military here is a disgusting displaying of trying to wield power over the American people and over immigrants,” Rice said.
Despite rain, thousands of people of all ages turned out in and around Bryant Park in Midtown Manhattan, many carrying homemade signs that played off the “No Kings” theme.
“No crown for a clown,” said one.
Actor Mark Ruffalo was among the demonstrators, wearing a hat that read “immigrant”.
“We’re seeing dehumanising language towards LGBT people, towards people with autism, towards people with other disabilities, racial minorities, undocumented people,” said Cooper Smith, 20, from upstate New York.
“Somebody’s got to show that most Americans are against this.”
Thousands packed Chicago’s Daley Plaza and surrounding streets yesterday under the iconic Picasso statue.
Some chanted “Lock him up!” in reference to the president.
Allan Hallie, a 70-year-old retired gastroenterologist, travelled from the northwest Indiana town of Ogden Dunes to protest policies of the Trump administration.
“I am quite afraid of the direction of this country,” he said.
Members of the far-right Proud Boys, ardent Trump supporters, appeared at an Atlanta “No Kings” protest, wearing the group’s distinctive black and yellow colours.
About 400 protesters, organised by a group called RefuseFascism.org, marched through Washington and gathered for a rally in a park opposite the White House.
Trump had warned people against protesting at the parade itself, saying that “they’re going to be met with very big force.”
Sunsara Taylor, a founder of RefuseFascism, told the crowd, “Today we refuse to accept Donald Trump unleashing the military against the people of this country and in the streets of this country. We say, ‘hell no.'”
Rare spectacle
Military parades in the US are rare.
Other countries usually stage them to celebrate victories in battle or showcase military might.
In 1991, tanks and thousands of troops paraded through Washington to celebrate the ousting of Iraqi President Saddam Hussein’s forces from Kuwait in the Gulf War.
Thousands of agents, officers and specialists will be deployed from law enforcement agencies from across the country and drones operated by the secret service will keep watch overhead.
The US army has brought nearly 7,000 troops into Washington, along with 150 vehicles, including more than 25 M1 Abrams tanks, 28 Stryker armoured vehicles, four Paladin self-propelled artillery vehicles, and artillery pieces including the M777 and M119.
The flyover will include Apache and Black Hawk helicopters along with Chinooks.
Older aircraft like the World War II-era B-25 bomber and P-51 Mustang will also take part.