WHAT TO KNOW

* National Guard troops deployed to Washington this month to support President Donald Trump’s effort to mitigate crime began carrying firearms Sunday evening, according to the federal task force managing the operation. * Chicago’s mayor blasted Trump’s threat to deploy the National Guard to his city as a “flagrant violation” of the Constitution and said he was looking at legal options to prevent soldiers from overtaking the city. * Postal services across the world are halting shipments to the United States this week amid mounting confusion over new import duties that will apply to parcels starting Friday. * Kilmar Abrego Garcia, whose arrest and fight to stay in the U.S. has become a flashpoint in Trump ’s immigration crackdown, surrendered this morning to U.S. immigration

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