DAY 534: 1/6 panel enters crucial phase of investigation

<p>The 1/6 committee is about to hear from Pat Cipollone only days before the next planned public hearing. It comes as the former President heads to Las Vegas to stump for Nevada GOP candidates. Plus, British PM Boris Johnson announces his resignation after a series of scandals. Jeff Mason, Andrew Weissman, Carlos Curbelo, Gillian Tett, Mandie Landry, and Carmen Best join.</p>