Trump supporters and counter-protesters have clashed in wild scenes at Pacific Beach in San Diego.
A pro-Trump "Patriot March" yesterday descended into chaos after counter-protesters also arrived at the pier where about 100 Trump supporters had gathered.
The counter-protesters were dressed in black, many saying they were Black Lives Matter supporters and others describing themselves as anti-fascists and wearing Antifa clothing.
Tempers started to flare at about 1pm when the two groups clashed, with screaming matches breaking out between the protesters.
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As the situation continued to escalate, police officers were struck with glass bottles, eggs and rocks according to the San Diego Police Department.
Footage from the scene shows a group of Antifa protesters confronting a smaller group of Pro-Trump marchers.
One man can be heard yelling "f*** Trump" as the two groups square off against each other.
One of the Antifa members then pulls out a can and sprays an unknown orange substance into the faces of the Trump supporters.
As the Trump group run away covering their faces, the counter-protesters pursue them, throwing objects and yelling "go home b***hes".
Police declared the protest unlawful at about 2.30pm due to the continued violence.
"Those who remain or return against this lawful order may be cited/arrested and risk exposure to chemical agents and less-lethal force applications," police said in a tweet.