NPR News Now covers UN human rights experts alleging U.S. war crimes in the Iran conflict, which the White House dismisses. The episode also features Canadian PM Mark Carney addressing the EU Parliament amid trade tensions and the U.S. Postal Service halting a controversial mail-voting system. Additionally, it reports on Robert F. Kennedy Jr. speaking at an anti-vaccine conference, a tribute to a Los Angeles reporter killed in a helicopter crash, and a sharp rise in mortgage rates driven by Federal Reserve interest hikes.