President Donald Trump has expressed frustration with national security adviser Michael Waltz over the use of the Signal app for discussing sensitive military operations, which inadvertently included journalist Jeffrey Goldberg in a group chat. The incident has raised security concerns, but Trump's irritation is reportedly more about Waltz having Goldberg's contact information than the app's use. Additionally, Trump's discussions with Waltz about withdrawing Rep. Elise Stefanik’s nomination as U.S. ambassador to the UN have added to his frustration, though both Waltz and Defense Secretary Pete Hegseth remain in their positions.