A petition urging the Donald Trump administration to formally classify the Antifa movement as a terrorist organization has been launched on the White House website.

The petition was started Thursday, and as of Sunday, had garnered over 90,000 signatures.

The White House is obliged to review the initiative if it reaches the benchmark of 100,000 signees by September 16 – within the 30 day period.

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The author of the petition said anti-fascists should be recognized as terrorists because of their “violent actions in multiple cities and their influence in the killings of multiple police officers throughout the United States.”

He added that "terrorism is defined as the use of violence and intimidation in pursuit of political aims,” and urged the Pentagon to be “consistent in its actions.”

“Just as they rightfully declared ISIS a terror group, they must declare Antifa a terror group – on the grounds of principle, integrity, morality, and safety,” the wording of the petition said.

Antifa or the extreme left is known for its violent rivalry with white supremacists and other far-right groups across America.

Last Saturday saw violent clashes between a Unite the Right rally and an Antifa counter-protest in Charlottesville, Virginia.

The violence culminated in a right-wing a activist plowing his car through the crowd, killing one person and injuring 19 others.

President Trump came under fire following the Charlottesville events, as he initially stopped short of condemning the white supremacists and instead placed blame on ”all sides.”

READ MORE: Additional charges against Charlottesville attack suspect bring total to 10 felonies

“What about the alt-left that came charging at, as you say, at the alt-right? Do they have any assemblage of guilt?” the US leader said.

“What about the fact that they came charging with clubs in their hands swinging clubs? Do they have any problem? I think they do. That was a horrible, horrible day,” Trump added.

Hundreds of right-wing demonstrators and thousands of left-winger counter-protesters flocked to a park in downtown Boston Saturday for simultaneous rallies.

Security has been boosted, with backpacks, sticks and any other items that can be used as weapons banned.

READ MORE: Trump’s Arts committee resigns in protest over Charlottesville remarks

Before the rally, the Boston Antifa branch has called on its members and supporters to “confront fascism” at Saturday’s rally.

“We'll see who really, really has the guts at this rally,” the group said in an online video, WCVB reported.

In January, a petition to class the Black Lives Matter movement as terrorist organization was launched. However, it failed to reach the required benchmark, collecting less than 1,000 signatures in a month.

Antifa opponents welcomed the petition on social media, urging followers to sign it as well.

Signed! It's so indicative of DC being the swamp that We The People have to sign a petition for something that should of already be done. — Chunghee Gangjeon (@Chungqee) August 19, 2017

It is definitely a domestic terrorist goon squad, & it resulted in one of their own being killed. — Jeree Gee Stavich (@JereeGeeStavich) August 19, 2017

Some users expressed belief that with Trump in office, the initiative had a real chance of passing.

This petition would be scrubbed & meaningless if Obama was still in WH, but now it has a fighting chance to be heard & acted upon. — LockEmAllUp (@Sig45Mike) August 18, 2017

Antifa will destroy much of our nation if not stopped! — Terry Jennings (@TerryStAug) August 19, 2017

Antifa supporters suggested that right-wing groups and their sympathizers had no moral right to demand anyone being labeled terrorist, as they’re themselves are guilty of extremist behavior.