Chaos erupts at Hong Kong airport as police, protesters clash; New video shows police engaging Dayton shooter; Sanford talks possible GOP primary challenge to Trump; Warren surges in polls, draws crowds in Iowa

Trump on violent Hong Kong protests: "Hope it works out"; Hong Kong protests stretching nearly three months; Trump claims McConnell supports expanded background checks, despite McConnell's office saying otherwise; Dem Sen. Murphy: Trump believes there's a deal to be had; Police: Dayton shooter communicated with sister and companion in hour leading up to massacre; Sanford heads to NH as he weighs Trump 2020 challenge; Sanford: Trump should not be GOP nominee in 2020; Inside the Warren Iowa campaign strategy; Sanders attacks Washington Post, New York Times; Sanders walks back Bezos comments, still slams media; Cuccinelli changes statue of Liberty poem to make case for Trump's new rules to limit immigration; Crying girl's father tracked down after ICE raid caused confusion about his location

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