The Situation Room with Wolf Blitzer and Pamela Brown

Warren and Sanders to share stage with moderates; O'Rourke, Buttigieg aim to recapture lost momentum; CNN debates last chance for some democrats to break through; Debate highlights split between progressives and moderates; Poll: Biden top choice of democrats in new national poll

Trump calls activist Al Sharpton a "con man"; Trump picks a loyalist, GOP Rep. John Ratcliffe, to replace Director of National Intelligence Dan Coats; 107 House Dems support an impeachment inquiry into Trump; Trump's lawyers ask Federal Court to bar House Dems from obtaining his New York state tax returns; New poll: Biden recovers, Harris slips as CNN debates near; Police: Gunman used assault-type rifle to attack festival; Police: Gunman killed a boy, teen and man in his twenties; Russian Opposition Leader suggests he was poisoned in custody

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Trump calls activist Al Sharpton a "con man"; Trump picks a loyalist, GOP Rep. John Ratcliffe, to replace Director of National Intelligence Dan Coats; 107 House Dems support an impeachment inquiry into Trump; Trump's lawyers ask Federal Court to bar House Dems from obtaining his New York state tax returns; New poll: Biden recovers, Harris slips as CNN debates near; Police: Gunman used assault-type rifle to attack festival; Police: Gunman killed a boy, teen and man in his twenties; Russian Opposition Leader suggests he was poisoned in custody

Democrats take big step toward possible impeachment by suing for secret grand jury information from Mueller report; Trump on new impeachment threats: Dems "Want to go fishing"; Trump lashes out at Fox News poll showing him losing to Joe Biden and Bernie Sanders; As CNN debate near, Biden previews aggressive approach while Harris says she will be polite; New poll shows Biden far ahead of other democrats; North Korea boasts of missile firings as Trump downplays threat

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Democrats take big step toward possible impeachment by suing for secret grand jury information from Mueller report; Trump on new impeachment threats: Dems "Want to go fishing"; Trump lashes out at Fox News poll showing him losing to Joe Biden and Bernie Sanders; As CNN debate near, Biden previews aggressive approach while Harris says she will be polite; New poll shows Biden far ahead of other democrats; North Korea boasts of missile firings as Trump downplays threat

Senate Intelligence: U.S. must create effective deterrence against an ongoing Russian threat to elections; Bipartisan senate report says vulnerabilities remain after 2016 Russian election attack; Hours after Mueller warns of Russian interference, GOP senators block elections security bills; Pelosi: Won't discourage democrats from supporting impeachment; House voting on controversial budget and debt deal; Democrats debate next steps after Mueller testimony; Documents reveal hundreds of red flags raised internally about how Trump administration was separating families at border; Biden jabs back at rivals as CNN debate nears;

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First Trump comments after testimony from Robert Mueller; Mueller: Trump was not exonerated, Russia's election attack was no hoax and investigation was no witch hunt; Sources: Trump watched Mueller hearings closely, his mood changed from one of irritation to triumph; Standing by for news conference by democratic leaders; Mueller: Trump's tweets admiring WikiLeaks' release of DNC emails were "Problematic"; May have boosted illegal activity; Democratic leaders speak out after Mueller's testimony;

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Trump talks "witch-hunt" ahead of Mueller testimony; Sources: He keeps asking what to expect from hearings; Justice Dept. to Mueller: Stay within "boundaries" of report; Trump continues attacks on Dem Congresswomen, blames one for keeping Amazon out of New York; Biden releases criminal justice reform plan; Wolf one-on-one with presidential candidate Bill de Blasio; Justice Dept. Launching broad antitrust review of big tech; North Korea shows Kim Jong Un inspecting submarine; If deployed, sub could put U.S. in missile range

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Trump lashes out at Mueller, then admit he "probably" will watch his testimony before congress "a little bit"; Mueller to make opening statement before testimony on Wednesday; justice department does not have a copy; Trump accuses Iran of "another lie" after the Iranians charge 17 people with spying for CIA; Trump escalates attacks, calls democrat congresswomen "racist"; Trump: Ready for "The absolute worst" with Iran; Trump: Could win Afghanistan war in a week but "I just don't want to kill 10 million people"; Trump Attorney: No "War room" for Mueller testimony response; Judiciary committee dems plan two-hour mock hearing tomorrow afternoon ahead of the Mueller's testimony; Iran releases video of crew from seized British tanker; Trump says it's getting harder "to want to make a deal"; Trump: Four democratic congresswomen are "bad for our country" but "easy to handle"; Trump: Having "Very good talks" on budget and debt deal; Judiciary committee dems plan two-hour mock hearing tomorrow afternoon ahead of the Mueller's testimony; Outrage in Puerto Rico; Protesters rally in Puerto Rico as pressure mounts on embattle governor to step down; Trump: "Will have to find out" about report Chinese tech firm blacklisted by the United States secretly helped North Korea; Trump says budget and debt ceiling deal has been reached;

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Officials: Iran seizes two oil tankers in what the U.S. military believes was a preplanned operation; Source: U.S. military is flying cover for an American commercial ship in the gulf; Trump: In touch with Britain on Iran's seizure of tankers; Calls Iran "Trouble, Nothing but Trouble"; Trump renews attacks on Rep. Omar, praises his own supporters who chanted "Send Her Back" at rally; Lawmakers hold mock hearings ahead of Mueller testimony; Democrats to press Mueller on areas of potential Trump obstruction; 195 Million across U.S. face deadly heat wave; Russia tests missile system in the Arctic for the first time; Advanced weapon could pose threat to U.S. aircraft

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