A US federal agent shot a motorist in Chicago on Saturday as a judge blocked President Donald Trump's bid to deploy troops into Portland, with tensions spiking in both Democratic cities where the US leader says a security emergency requires military intervention.

They are the latest flashpoints in the Trump administration's aggressive mass deportation campaign that has seen heavily militarized raids and protests in places like Los Angeles and Washington.

Trump has repeatedly called Portland "war-ravaged" and riddled with violent crime, but in Saturday's court order, US District Judge Karin Immergut wrote "the President's determination was simply untethered to the facts."

"Defendants presented evidence of sporadic violence against federal officers and property damage to a federal buildin

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