President Trump's 10 percent baseline tariff on nearly all goods imported to the U.S. went into effect early Saturday. It comes ahead of steeper tariffs set to begin in the coming days, and after a massive market sell-off over concerns about the trade war's economic impact. NBC News' Christine Romans has the details. Protesters in cities across the country demonstrated against Trump administration policies on Saturday, with many voicing concerns about cuts to the federal government and the President's economic policies. NBC News' Vaughn Hillyard has the latest. Dangerous storms slammed parts of the southern U.S. on Saturday, with millions of people under flood alerts. NBC News' George Solis has more. The measles outbreak in Texas has exploded in size to nearly 500 cases. At one day care center in the state, concerns are growing after six young children tested positive for the disease. NBC News' Maya Eaglin has the latest. In California's Central Valley, where much of the produce and nuts made in the U.S. are from, undocumented farm workers are grappling with increased anxiety over President Trump's plans for mass deportation. NBC News' Steve Patterson has more. Across the country, outgoing medical school students and graduates are celebrating "Match Day," and the life-changing moments when they find out if and where they match with a residency program on their way to becoming doctors. NBC News' Jose Diaz-Balart has more in this week's Good News Wrap-Up. 

The Dow closed down and the NASDAQ was up slightly as President Trump threatened new tariffs on imports from China. Despite criticism over his tariffs, the president said they will create a ‘beautiful picture' for American workers and the economy in the end. NBC News' Gabe Gutierrez reports. Heavy rains and flash flood blasts through multiple states, forcing urgent rescues. NBC News' Maggie Vespa reports from hard hit Tennessee. There is growing concern in Texas after a second unvaccinated child dies from measles. This comes as the outbreak has expanded to include five more counties in Texas. NBC's Priscilla Thompson reports on the ground in Lubbock, Texas, the epicenter of this health crisis, as the outbreak worsens. The Office of Personnel Management handles retirement paperwork for the entire federal government out of an old limestone mine in Pennsylvania. The process is set to be overhauled by Elon Musk's Department of Government Efficiency. NBC News' Garrett Haake got exclusive access inside. Billionaire Trump backer Bill Ackman is among the business leaders who have criticized the president's trade war. NBC News' Christine Romans reports Ackman called the tariffs a mistake and urged a pause in new tariffs. The Supreme Court has temporarily paused a lower court's order to return a deported man to the U.S. from El Salvador. Court documents show the man entered the U.S. illegally in 2011 and the Trump administration said he is an MS-13 gang member, which he denies. NBC News' Tom Costello reports. In Maine, one mother says her children were given melatonin without her permission at their day care. Last year, childcare staff in New Hampshire, Washington and Indiana also made headlines for giving melatonin to children. While parents should consult a doctor, some pediatricians do not recommend melatonin use in kids under age five. NBC News' Vicky Nguyen reports.