Fmr. Secretary of Homeland Security reacts to Russia-linked ads

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The Democrats on the House Intelligence Committee are revealing that thousands of advertisements linked to the Kremlin were placed on Facebook and Instagram. This comes as a new transatlantic, bipartisan commission to prevent election meddling launches today. Michael Chertoff, former Secretary of Homeland Security who is co-chairing the commission, joins Andrea Mitchell to discuss efforts to prevent Russian meddling.