Welcome to the Fox News Politics newsletter, with the latest updates on the Trump administration, Capitol Hill and more Fox News politics content. Here's what's happening-What is a bolt action rifle? What we know about the gun used to kill Charlie Kirk-Charlie Kirk murder spurs first-in-the-nation state political violence hate crime legislation-Charlie Kirk memorialized by dozens of House lawmakers condemning political violenceThe rifle that federal investigators believe was used in the shooting that killed conservative activist Charlie Kirk contained ammunition inscribed with anti-fascist messaging, shedding light on the suspect's motive.Utah Gov. Spencer Cox confirmed the messaging at a news conference Friday, saying investigators discovered inscriptions on casings found with a bolt-action rifle near the Utah Valley University campus, where Kirk was killed during an event.One used casing and three unused casings contained the writings, Cox said.News of the ammunition inscriptions was first shared on social media Thursday morning in a preliminary bulletin attributed to the Bureau of Alcohol, Tobacco, Firearms and ExplosivesREAD MORE.SECURITY GAP: Questions mount over security failures in Charlie Kirk shooting as manhunt intensifiesROGUE AGENT: Secret Service employee who celebrated Charlie Kirk's assassination put on immediate leave'LEGACY WILL ENDURE': Top conservative speakers vow they 'will not be silenced' after Charlie Kirk's assassination'SURE HE DOESN'T MIND': Ex-prosecutor Carol Siemon sparks outrage after blaming Charlie Kirk for assassinationHIS LAST DAY: Charlie Kirk's last 24 hours before his Utah assassination: messages of faith, justiceMEDIA MADNESS: White House torches media after killers mother admits son shouldve been jailed before Zarutska murderPRESIDENTIAL PUNCH: Trump reveals new nickname for Mamdani weeks before Election DayRYAN ROUTH TRIAL: Flashlight, rifle, backpacks: prosecutors outline Ryan Rouths alleged sniper setupSTEALTH SUPREMACY: Americas new stealth B-21 Raider takes next step with second bombers first flightBLAME GAME: 'This is on all of us': Lawmakers take hard look at how political rhetoric played role in Kirk's assassination'FULL OF SH--': Social media erupts over 'Squad' Dem's interview after Charlie Kirk assassination: 'Needs to resign'GUARD DOGS: Blackburn cheers Trump's move to 'Make Memphis Safe Again'MEMPHIS ON GUARD: Memphis rep torches 'Trump Show 2.0' with National Guard, says DC isn't safer after last crackdownGUARDING IN MEMPHIS: Trumps Memphis National Guard news boosts Hagerty's aisle-crossing work to crush city crime, senator saysPOWER PLAY POLITICS: Trump-backed congressional map passes Senate in crucial Midwestern state: 'Commonsense values'Get the latest updates on the Trump administration and Congress, exclusive interviews and more on FoxNews.com.