Trump's challenges Biden to a debate as Nikki Haley bows out of the race. Her support are scrambling for another option. Which way will they go? Plus, the breaking news tonight, Arizona's investigation into efforts to overturn the 2020 election is getting bigger as new subpoenas are issued. Also, a CNN exclusive, our Ivan Watson spends 48 hours on a Philippine coast guard ship as it suddenly is confronted by the Chinese.
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