President Trump said his national security advisor does not need to apologize after a reporter said Michael Waltz mistakenly invited him into an encrypted group chat about military operations. Democrats accused the Trump officials of a security breach. NBC News' Peter Alexander reports. Doctors say concerned parents can get their children the measles vaccine as early as six months rather than at the one-year mark which has been the standard recommendation. As the measles outbreak in Texas reaches nearly 330 cases, NBC News' Emilie Ikeda reports on what parents should know to keep their youngest children safe. Frank Bisignano, President Trump's pick to lead the Social Security Administration, faced senators in a high-stakes hearing on Tuesday as concerns over potential changes to entitlement programs mount. NBC News' Ryan Nobles reports. A Maui anesthesiologist was arrested in Hawaii after police say he tried to kill his wife on a popular hiking trail. NBC News' Marissa Parra has the latest on the investigation.  

President Trump has announced 25% tariffs on imported cars and auto parts. According to a Goldman Sachs estimate, that could add $5,000-$15,000 to the cost of a foreign-made car and $3,000-$8,000 to cars made in the U.S. with parts from overseas. NBC News' Christine Romans spoke to an owner of dealerships in Michigan, who says customers are calling, looking for deals before the tariffs kick in. The Department of Health and Human Services plans to cut 10,000 jobs across several agencies as part of the Trump administration's efforts to restructure the federal government. According to HHS, the ‘dramatic restructuring' will save taxpayers $1.8 billion annually. NBC News' Anne Thompson has the latest on what agencies the cuts will affect. 36-year-old Paul Kim was arrested in connection to an arson attack on Tesla location in Las Vegas. Kim faces a series of charges, including arson, destruction of property and possession of an explosive device, stemming from the March 18 attack. NBC News' Liz Kreutz reports. President Trump is privately angry with national security adviser Mike Waltz for mistakenly including a journalist in an encrypted group chat about a military strike in Yemen, according to two GOP sources with knowledge of the conversations. Meanwhile, a judge ordered members of that chat to preserve their Signal texts. NBC News' Peter Alexander reports. The FAA announced today all helicopters flying around Reagan National Airport must turn on their geo-positioning transmitters, known as ADSB. The helicopter that collided with a passenger plane near Reagan in January did not have ADSB on, which was approved by the Army. NBC News' Tom Costello reports family members of the 67 people who died in the collision were at the hearing. NBC News' Molly Hunter reports on the ground from the northernmost capital in the world, Nuuk, Greenland as the Vice President, the Second Lady, National Security Advisor Mike Waltz and the rest of the U.S. delegation arrive tomorrow on the remote island but won't set foot in a Greenlandic city. The U.S. Delegation has scaled back the visit and now will only visit the American base on the remote island. Molly Hunter speaks with Greenlandic officials and people who live in Greenland about the U.S. visit and their reaction to this semi-autonomous Danish territory being at the center of controversy.