Portland has been in a very difficult situation. If there had been a mature constructive leader in the White House, the mayor and governor would have sought out federal help. Instead, we had someone in the White House more interested in pouring gasoline on a volatile situation. Under the circumstances, I can understand why the local authorities were not eager to seek out federal assistance.
There is plenty of blame to parcel out for why things went as badly as they did in Portland. But a big part of it was having a president who lacks a constructive bone in his body. In many ways, he and antifa were well-paired. They both are essentially spoilers with nothing positive to offer.