Antifa will be designated by the United States as a terrorist organization, President Donald Trump announced after midnight on Sept. 18 while visiting the United Kingdom.

"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 posted on Truth Social.

The president said he would also strongly recommend that anyone funding the group be investigated.

Jill McLaughlin reports for The Epoch Times that Trump's announcement was made after he and the first lady met with Britain's royal family at Windsor Castle on the first day of a two-day state visit to the UK.

On Monday, Trump hinted at the designation, saying he would support it in the wake of the assassination of Christian conservative commentator Charlie Kirk last week.

"It's something I would do, yeah, if I have the support from the people back here," Trump said, referring to administration officials standing behind him, including Attorney General Pam Bondi.

"Antifa is terrible," Trump added.