Lindsey Graham & Rudy Giuliani subpoenaed in GA’s Trump election investigation

Tonight on the Last Word: The Georgia investigation is scrutinizing Sen. Lindsey Graham’s post-election call to Georgia’s secretary of state. Also, the January 6th Committee announces its next public hearing will be on July 12th. Plus, the suspect in the Highland Park shooting is charged with seven counts of first-degree murder. And the Uvalde schools’ police chief resigns from City Council. Michael J. Moore, Andrew Weissman, Claire McCaskill, Rep. Adam Schiff, Shannon Watts and Texas State Sen. Roland Gutierrez join Lawrence O’Donnell.