Amb. Michael McFaul: "There's now momentum on the side of the Ukrainians"

Former U.S. Ambassador to Russia, Michael McFaul, joins Andrea Mitchell to discuss Speaker Pelosi's meeting with President Zelenskyy, Dr. Jill Biden's Mother's Day trip to Romania and Slovakia, recent comments by Russian Foreign Minister Sergei Lavrov, and the overall positive momentum 'on the side of the Ukrainians' that's happening right now.