WASHINGTON — President Donald Trump on Monday signed an order designating a decentralized movement known as antifa as a domestic terrorist organization, though whether he can actually do that remained unclear. Trump blames antifa for political violence.

The Republican president said on social media last week during a state visit to the United Kingdom that he would be making such a designation. He called antifa a “SICK, DANGEROUS, RADICAL LEFT DISASTER” and said he will be “strongly recommending” that its funders be investigated.

The White House released Trump’s executive order shortly after he departed for New York, where he was addressing the annual meeting of the U.N. General Assembly on Tuesday.

Here are a few things to know about Trump and antifa:

Short for “anti-fascists,” antifa is not a single organization but rather an umbrella term for far-left-leaning militant groups that confront or resist neo-Nazis and white supremacists at demonstrations.

Antifa is a domestic entity and, as such, is not a candidate for inclusion on the State Department’s list of foreign terror organizations. Dozens of groups, including extremist organizations like the Islamic State and al-Qaida, are included on that list. The designation matters in part because it enables the Justice Department to prosecute those who give material support to entities on that list even if that support does not result in violence.

But there is no domestic equivalent to that list in part because of broad First Amendment protections enjoyed by organizations operating within the United States. And despite periodic calls, particularly after mass shootings by white supremacists, to establish a domestic terrorism law, no singular statute now exists.

The executive order did not specify how Trump he would go about designating antifa as a domestic terrorist organization.

Literature from the antifa movement encourages followers to pursue lawful protest activity as well as more confrontational acts, according to a 2018 Congressional Research Service report.

The literature suggests that followers monitor the activities of white supremacist groups, publicize online the personal information of perceived enemies, develop self-defense training regimens and compel outside organizations to cancel any speakers or events with “a fascist bent,” the report said.

People associated with antifa have been present for significant demonstrations and counter-demonstrations in recent years, including mobilizing against a white supremacist march in Charlottesville, Virginia, in August 2017. They were also present during clashes with far-right groups in Portland, Oregon.

He says it’s a very bad and “sick” group. The executive order says antifa “uses illegal means to organize and execute a campaign of violence and terrorism nationwide” to accomplish its goal of overthrowing the U.S. government. The order calls on relevant government departments and agencies to use every authority to investigate, disrupt and dismantle any and all illegal operations, including terrorist actions conducted by antifa or anyone claiming to act on its behalf.

In Trump’s first term, he and and members of his administration singled out antifa as being responsible for the violence at protests triggered by the killing of George Floyd, a Black man who died after a white Minneapolis police officer pressed his knee into Floyd’s neck for several minutes and held it there even after Floyd stopped moving and pleading for air.

Then-Attorney General William Barr described “antifa-like tactics” by out-of-state agitators and said antifa was instigating violence and engaging in “domestic terrorism” and would be dealt with accordingly.

At the time, Trump blamed antifa by name for the violence, along with violent mobs, arsonists and looters.

He recently began singling out antifa again by name following the Sept. 10 assassination of conservative youth activist Charlie Kirk, who was a big supporter of the president.

In an exchange with reporters in the Oval Office last week, Trump said he would pursue a domestic terrorism designation for antifa if such a move had the support of Pam Bondi, the current attorney general, and other Cabinet members.

“It’s something I would do, yeah,” Trump said. ”I would do that 100%. Antifa is terrible.”

He previously had called for antifa to be designated as a terror organization after skirmishes in Portland, Oregon, during his first term.

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