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The presence of federal law enforcement officers on the streets of Portland is questionable.
Mr Barr is to say that the Department of Justice’s decision to send out security forces to the city of Portland, Oregon, was justified following attacks on federal structures there.
Portland has actually seen 61 successive days of demonstrations, which intensified after federal officers arrived this month.
The mayors of Portland, Chicago, Seattle, Albuquerque (New Mexico), Kansas City (Missouri) and Washington DC signed a letter on Monday implicating the Trump administration of “egregious use of federal force”.