Pres. Trump Says He'd invoke Executive Privilege To Block Bolton Testimony At Senate Impeachment Trial; Secretary Of State Pompeo's Definition Of "Imminent"; New CNN Poll: Tight Race In Iowa Gets Tighter; Vaguely Specific, And Specifically Vague; Pompeo Won't Define "Imminent" On Threat From Iran; Pres. Trump Now Claims Soleimani Targeted 4 U.S. Embassies, Without Evidence Or Explanation Of "Imminent" Threat; "Lock Her Up" Blows Up; Justice Dept. Suggests No Evidence To Support Criminal Charges Against Hillary Clinton, Clinton Foundation; New Iowa Caucus Poll; New CNN-Des Moines Register Poll: Razor-Tight Race in Iowa; New Poll: Sanders Surges Amid 4-Way Fight For First Place In Iowa; Pres. Trump's New Threat As Impeachment Trial NearsTo learn more about how CNN protects listener privacy, visit cnn.com/privacy
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