House Oversight Committee Chairman Rep. James Comer, a Republican from Kentucky, says members of Congress "feel a lot safer" now that law enforcement has arrested the man accused of the Charlie Kirk assassination.

Tyler Robinson, 22, had earlier expressed to family his opposition to the viewpoints of the conservative activist, the authorities said Friday in announcing an arrest in a targeted killing that raised fresh alarms about political violence in the United States.

Robinson indicated to a family friend afterwards that he was responsible, said Utah Gov. Spencer Cox. He also cited as key pieces of evidence engravings on bullets found in a rifle believed used in the attack as well as chatting app messages attributed to the accused shooter that a roommate shared with law enforcement after the shooting.

"We're all concerned right now," Comer added while speaking to reporter on Captiol Hill Friday morning. "And I think we all know that the political temperature in America is too high. I think both parties can accept responsibility for that."

The assassination offers the latest example of how ordinary security measures can be defeated in an era of escalating political violence, when anyone associated with the political process is a potential target. Security experts interviewed by AP questioned whether the event was sufficiently staffed but also acknowledged the limitations of both campus police forces and outdoor venues.