The Secret Service is under pressure to strengthen security amid unprecedented political threats after the assassination of activist Charlie Kirk and attempts on President Donald Trump.

The rifle found in Charlie Kirk's assassination was a bolt-action weapon that requires manual operation between shots and often retains spent cartridges in the chamber.

Brilyn Hollyhand told Fox that Kirk has never "been afraid of one day" and wasn't afraid ahead of embarking on his American Comeback Tour, which kicked off on Wednesday.

Ryan Routh's trial opens with prosecution alleging he traveled from Hawaii with assault rifle, ammunition and burner phones to target Trump at golf course.

House lawmakers were left shaken and worried for their own safety after another politically motivated killing in the United States.

President Trump on Thursday said he will award the Presidential Medal of Freedom, the nation's highest civilian honor, to Charlie Kirk, the 31-year-old conservative activist who was shot to death during a Wednesday event in Utah.

Law enforcement officials on Thursday said the assassin who killed Charlie Kirk is believed to be college-aged, and that investigators recovered a weapon potentially used to shoot the conservative activist during his speaking event at Utah Valley University a day earlier.