This week's edition of The 45th newsletter.

President Trump has ordered an end to the Obama-era Deferred Action for Childhood Arrivals (DACA) program that shields young undocumented immigrants from deportation, urging Congress to pass a replacement before he begins phasing out its protections in six months.

From March, some of the hundreds of thousands of young adults who came to the United States illegally as children (and qualify for the DACA program) will become eligible for deportation. The five-year-old policy allows so-called "Dreamers" to remain in the country and the right to work legally.

Microsoft is among a number of large US companies now vowing to defend its Dreamer employees in court if the government tries to deport them. Brad Smith, the company president, said in a blog post Tuesday that President Trump's decision to end the program is "a big step back for our entire country [and] if the government seeks to deport any one of them, we will provide and pay for their legal counsel".

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