[link to en.wikipedia.org (secure)]

It’s a state law, not federal, and very few states at that. It also requires approval of a judge, so not exactly ‘warrantless.’

Trump floated the idea, NEVER introduced it, and subsequently backed off.

“ While campaigning for the Democratic nomination for president in 2019, Senator Kamala Harris of California called for legislation to create "domestic terrorism prevention orders," which would "give law enforcement and family members of suspected white nationalists or domestic terrorists the ability to petition a federal court to temporarily restrict a person's access to guns if the person exhibits clear evidence of being a danger."”