Anderson Cooper 360

Pres. Trump Moments Away From Officially Launching His 2020 Campaign; Pres. Trump In Orlando For Campaign Kickoff As New Poll Shows Biden, Sanders Would Beat Him In Florida; What Happened To Vetting; Acting Defense Secy. Shanahan Resigns, Addresses Reports Of Domestic Violence; Pres. Trump Doubles Down On Threat Of Immigration Roundup; Pres. Trump Doubles Down On Threat Of Immigration Roundup As He Officially Launches 2020 Campaign In Florida via Knit