President Donald Trump said Thursday he would designate the left-wing Antifa movement as a terrorist organization.

"I am pleased to inform our many U.S.A. Patriots that I am designating ANTIFA, A SICK, DANGEROUS, RADICAL LEFT DISASTER, AS A MAJOR TERRORIST ORGANIZATION," Trump, who is currently on a state visit to the United Kingdom, said in a post on his Truth Social network.

"I will also be strongly recommending that those funding ANTIFA be thoroughly investigated in accordance with the highest legal standards and practices."

Antifa is a left-wing, anti-fascist and anti-racist political movement. It is not a centralized organization, but rather a loosely affiliated network of groups and individuals.

Trump did not initially specify how the designation would work in practical terms. The Republican president had already announced a similar classification during his first term in office.