Gordon Sondland didn't just drop a bombshell, he unleashed an artillery. In testimony that might change the dynamic of the impeachment inquiry, the Ambassador to the European Union confirmed the existence of a quid pro quo, linked President Trump to the effort to pressure Ukraine, and pointed a finger at senior administration officials like Secretary of State Mike Pompeo and Vice President Mike Pence. CNN national security analyst Sam Vinograd guest hosts and unpacks a historic day on Capitol Hill with CNN senior political analyst John Avlon. Plus, CNN presidential historian Tim Naftali explains how today's revelations compare to the Watergate saga and why Republicans might finally turn on Trump.

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