The assassination of conservative activist Charlie Kirk has rattled lawmakers on Capitol Hill, plunging members of Congress into a new cycle of fear about their own safety and setting off a scramble to boost security in ways that some warn could reshape the relationship between elected officials and the public they represent.

Kirk, 31, was fatally shot on Wednesday while addressing a large outdoor crowd at Utah Valley University. The FBI has yet to identify the gunman or determine a motive, though the agency has released photos of a person of interest they believe is tied to the shooting. The attack, brazen and public, has been the latest flashpoint in a string of politically motivated violence that has shadowed American politics in recent years, including two assassination attempts

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