State Rep. Hoan Huynh, a Democrat from Chicago who is running to represent the 9th District, was in his vehicle about 11:30 a.m. near Montrose and Kimball avenues in Albany Park, a news release from his campaign said.
Huynh was in the area after hearing of possible U.S. Immigration and Customs Enforcement activity, the release said.
Huynh says he got a tip that agents were detaining people on the streets and wanted to warn residents of their rights.
The release said six armed CBP agents blocked the front and back of his vehicle, and approached the car.
Huynh's campaign said the agents blocked him and staffers from following an unmarked car with ICE agents inside.
Huynh also said one of the agents pointed a weapon at him but that wasn't caught on the recording.
Huynh was eventually able to leave.
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Huynh shared cellphone video of the incident.
"This was federal agents using violent intimidation trying to silence us," Rep. Huynh said.
The Department of Homeland Security said in a statement, "Rep. Huynh was stopped, not once but, twice today for stalking law enforcement and attempting to interfere with operations. He was given a warning the first time he was stopped, and he ignored that warning forcing agents to get out of their car a second time to assess if he was a threat. This behavior is unbecoming of a public servant and is just another example of sanctuary politicians putting our officers at risk."
Huynh is a Vietnamese refugee who came to America as a child when his family was granted asylum after collaborating with American troops during the Vietnam War, the release said.
Farther north, a Rogers Park school says a vendor employee was detained Tuesday afternoon by federal agents.
The action drew parents to stand outside Decatur Classical School on Sacramento Avenue.
The school sent a letter to parents, saying this happened outside the school, and no students were present at the time.
Afternoon PE classes were moved inside as a result.
In the letter, the school says mental health professionals are available for students, and that "As a reminder, our school and CPS WILL NOT coordinate with federal representatives, and we WILL NOT allow ICE agents or any other federal representatives access to our school unless they produce a criminal judicial warrant."