US President Donald Trump said on Saturday that Portland is being monitored closely amid fears of clashes between right-wing groups and counterprotesters.

He warned the members of Antifa as they gathered in the state of Oregon to counter a rally by far-right groups.

Antifa stands for anti-fascist and refers to a loose international coalition of activists and protesters who oppose far-right ideology.

Al Jazeera's Rob Reynolds reports from Portland, Oregon.

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