Federal agents face off against protesters in Portland, Ore.

Federal officers use chemical irritants to disperse protesters outside federal courthouse in Portland
A bloodied demonstrator is arrested by federal police during a Black Lives Matter protest at the Mark O. Hatfield United States Courthouse on Monday in Portland, Ore.
(Noah Berger / Associated Press)

PORTLAND, Ore. — Federal law enforcement officers’ actions at protests in Oregon’s largest city, conducted without local authorities’ consent, are raising the prospect of a constitutional crisis — one that could escalate as weeks of demonstrations find renewed focus amid clashes with camouflaged, unidentified agents outside Portland’s U.S. courthouse.

A topless protester gestures in front of federal police personnel in Portland, Ore.
A protester gestures in front of federal police personnel in Portland, Ore., as protests continue across the United States.
(AFP )
A demonstrator shouts slogans next to military veterans during a Black Lives Matter protest in Portland, Ore.
A demonstrator shouts slogans using a bullhorn next to a group of military veterans during a Black Lives Matter protest at the Mark O. Hatfield United States Courthouse in Portland.
(Marcio Jose Sanchez/Associated Press)
Federal officers advance on protesters during a Black Lives Matter demonstration in Portland, Ore.
Federal officers advance on protesters during a Black Lives Matter demonstration at the Mark O. Hatfield U.S. Courthouse in Portland, Ore.
(Marcio Jose Sanchez/Associated Press)
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Demonstrators use leaf blowers to blow back tear gas launched by federal officers during a protest in Portland, Ore.
Demonstrators use leaf blowers to try to blow back tear gas launched by federal officers during a Black Lives Matter protest at the Mark O. Hatfield United States Courthouse in Portland, Ore.
(Marcio Jose Sanchez/Associated Press)
Demonstrators sit and kneel as tear gas fills the air during a Black Lives Matter protest in Portland, Ore.
Demonstrators sit and kneel as tear gas fills the air during a Black Lives Matter protest at the Mark O. Hatfield United States Courthouse in Portland, Ore.
(Marcio Jose Sanchez/Associated Press)
A demonstrator plays a trumpet from atop a steel fence during a Black Lives Matter protest in Portland, Ore.
A demonstrator plays a trumpet from atop a steel fence during a Black Lives Matter protest at the Mark O. Hatfield United States Courthouse in Portland, Ore.
(Marcio Jose Sanchez/Associated Press)
A demonstrator speaks to a crowd from the bed of a pickup truck during a Black Lives Matter protest in Portland, Ore.
A demonstrator speaks to a crowd from the bed of a pickup truck during a Black Lives Matter protest at the Mark O. Hatfield United States Courthouse in Portland, Ore.
(Marcio Jose Sanchez/Associated Press)
A demonstrator argues with a federal officer during a Black Lives Matter protest in Portland, Ore.
A demonstrator argues with a federal officer during a Black Lives Matter protest at the Mark O. Hatfield United States Courthouse in Portland, Ore.
(Marcio Jose Sanchez/Associated Press)
Protesters carry umbrellas as they gather at the Mark O. Hatfield Courthouse in Portland, Ore.
Protestors carry umbrellas as they gather at the Mark O. Hatfield Courthouse in Portland, Ore.
(AFP)
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Federal officers walk through tear gas while dispersing a crowd at Mark O. Hatfield U.S. Courthouse in Portland, Ore.
Federal officers walk through tear gas while dispersing a crowd of about 1,000 people during a protest at Mark O. Hatfield U.S. Courthouse in Portland, Ore.
(Nathan Howard/Getty Images)
 A protester escapes a federal officer during an arrest attempt in Portland, Ore.
A protester escapes a federal officer during an arrest attempt in front of the Mark O. Hatfield U.S. Courthouse in Portland, Ore.
(Nathan Howard/Getty Images)
Hundreds of protesters hold their phones aloft on Monday in Portland, Ore.
(Noah Berger / Associated Press)
A federal officer pepper-sprays a protester in front of the federal courthouse in Portland, Ore., on Monday.
(Nathan Howard / Getty Images)
Portland demonstrators on Monday.
(Nathan Howard / Getty Images)
Federal agents use crowd-control munitions to disperse protesters on Sunday.
(Noah Berger / Associated Press)
Protesters flee through tear gas.
( Nathan Howard / Getty Images)
Federal officers on the streets of Portland on Tuesday.
(Noah Berger / Associated Press)
A naked woman confronts federal officers in Portland on Friday.
(Dave Killen / Oregonian)
Police walk through fire and smoke in Portland.
(Dave Killen / Oregonian)
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A protester walks past a line of federal officers on Tuesday.
(Nathan Howard / Getty Images)
Tear gas in Portland.
(Dave Killen / Oregonian )
Police respond to protesters.
(Dave Killen / Oregonian )
A police officer is silhouetted near a burning car.
(Mark Graves / Oregonian)
Outside the federal courthouse in Portland on Monday.
(Nathan Howard / Getty Images)
A federal officer points to a protester while clearing the street in front of the federal courthouse.
(Nathan Howard / Getty Images)
Federal agents try to disperse protesters.
(Noah Berger / Associated Press)
Protesters outside a police station in Portland.
(Sean Meagher / Oregonian )
Federal officers and a protester carrying an American flag face off.
(Nathan Howard / Getty Images)
Federal agents and tear gas.
(Dave Killen / Oregonian)
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A protester waves an American flag.
(Nathan Howard / Getty Images)
Federal officers stand guard.
(Nathan Howard / Getty Images)