and good day. i m andrea mitchell in washington continuing right now on msnbc, reports, a powerful reminder of our nation s painful history as americans across the nation celebrate juneteenth, commemorating the end of slavery in america. we ll take a look at the history of this holiday and how president biden is making a new push to engage black voters this year. a critical part of his base with a campaign co-chair south carolina congressman james clyburn. plus, a primary nail biter in virginia today, can the chair of the house freedom caucus hold onto his seat or will his trump-backed republican opponent emerge victorious? right now the results are too close to call. and we re on a severe watch across the eastern part and midwest of the country, the first tropical storm headed for texas as more than 7 million people from michigan to maine are sweltering under extreme temperatures. we ve got the latest on the forecast. we begin with the biden campaign s push to engage