GOP lawmakers want to amend the defense authorization bill. Social media newcomer Threads seeks to downgrade news and politics on its platform. And Guatemala's presidential election faces more chaos.Want more comprehensive analysis of the most important news of the day, plus a little fun? Subscribe to the Up First newsletter.Up First is produced by Nina Kravinsky, Shelby Hawkins and Kaity Kline. Our editors are Olivia Hampton, Rafael Nam, Michael Sullivan, Denice Rios and Alice Woelfle. Our technical director is Zac Coleman with engineering support from Stacey Abbott.