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headlines content inside politics we begin with breaking news, new details right now on president biden's announcement today that he will effectively shut down the southern border to asylum seekers coming into the us illegally. that would happen if daily illegal crossings hit a certain threshold. now, it's biden's most aggressive crackdown yet on illegal immigration and issue that has be bedeviled his president's presidency cnn's priscilla alvarez joins me now from the white house, brazil, i know you have all the details. give us the top leinz on this and the political implications dana, this is certainly presidents president biden's most dramatic move on. >> migration since he took office. and is intended to tackle head-on, one of his the biggest political vulnerabilities we're now learning from senior administration officials that they anticipate invoking this authority and using it later today. so in effect, this is