By Chelsea Bailey, CNN (CNN) — A nine-letter social media post was all it took for the Department of Homeland Security to spark a torrent of backlash online this week, drawing the ire of politicians and prompting comparisons to Europe’s far right. On Tuesday afternoon, DHS posted a declaration on X for immigrants to “remigrate,” threading a link to the agency’s self-deportation app. At first glance, the post could be seen as a straightforward reference to the Trump administration’s long-standing immigration policies, which have called for immigrants to “voluntarily self-deport” back to their home countries. But experts who study and...