More than 200 supporters of the Republican president rallied in downtown San Diego.
Organizers said they expected some protesters to oppose their message today, but so far that hasn't happened.
"You can pepper spray me again, you can punch me again, I'm here to defend speech", said Daniel Hampton, an Oakland resident.
"Seeing the people there that were trying to act like they represent women", she told Blake Farmer of member station WPLN, "it was appalling to me". At one point, after the first fight had broken out, a group of pro-Trump supporters were urged by one of their own to "take a knee so that the police can do their job", which about 12 of them did. At its height the crowd numbered about 250 people.
Organizers of the so-called Spirit of America rallies in at least 28 of the country's 50 states had said they expected smaller turn-outs than the huge crowds of anti-Trump protesters that clogged the streets of Washington, D.C., and other cities the day after his inauguration on January 20.
The Berkeley rally, however, had the most violent incidents. Five people were arrested on charges of battery and four on suspicion of assault with a deadly weapon - including one who allegedly possessed a dagger. Police reported items confiscated among the combatants were: "metal pipes, bats, 2x4s and pieces of wood". Blood was coming from his nose while a friend wiped it with a T-shirt. Smith and her husband brought their granddaughters to the event. Both had blood streaming from their faces. They chanted "No Trump".
Many wore patriotic attire and held Trump signs.
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The group took their rally outside, eventually deciding to go to a pedestrian bridge over U.S. Highway 52 where they honked and waved flags at motorists.
Counter-protesters have said that there is the potential for white nationalists to attend the march, but organizer Rich Black has pushed back against that suggestion in online postings, saying that no organizers have any association with white nationalist groups.
"We're not here to cause a problem".
At the nation's capital, almost a hundred people stood in the shadow of the Washington Monument to demonstrate their solidarity with the president.
The protest Saturday didn't rise to that level of violence.
"Every attempt was made to intercede during acts of violence or rapidly identify victims and suspects", the statement read. According to police, some demonstrators left the park and marched on Allston Way, which is one block from the BART station.
At Berkeley's event, which was scheduled to start at 2 p.m.at the Martin Luther King Jr.