10 things you need to know today: March 22, 2021

Mayorkas says U.S.-Mexico border is "closed," U.S. trial shows AstraZeneca's vaccine is 79 percent effective against COVID, and more

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1. Mayorkas says U.S.-Mexico 'border is closed'

Homeland Security Secretary Alejandro Mayorkas said Sunday that "the border is closed" on the southern edge of the United States, where a surge of undocumented migrants from Central America and Mexico threatens to overwhelm Border Patrol facilities. Mayorkas said the Biden administration was expelling adults and families but would not turn away "young, vulnerable children" because "that's not who we are." Speaking on NBC's Meet the Press, Mayorkas accused former President Donald Trump of having "dismantled the orderly, humane, and efficient way" of handling migrant children, and said the administration was "rebuilding those orderly and safe processes as quickly as possible." The rising number of migrants trying to cross the U.S.-Mexico border has become an urgent challenge for the Biden administration. Border agents caught more than 100,000 migrants in February, 28 percent more than in January.

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Harold Maass, The Week US

Harold Maass is a contributing editor at The Week. He has been writing for The Week since the 2001 debut of the U.S. print edition and served as editor of TheWeek.com when it launched in 2008. Harold started his career as a newspaper reporter in South Florida and Haiti. He has previously worked for a variety of news outlets, including The Miami Herald, ABC News and Fox News, and for several years wrote a daily roundup of financial news for The Week and Yahoo Finance.