MSNBC's Ari Melber hosts "The Beat" on Tuesday, September 13 and reports on the GOP escalating its push to roll back women's rights -- just 8 weeks before the midterms, with Senator Lindsey Graham introducing a bill that would ban abortion nationwide. Plus, billionaire philanthropist Bill Gates joins Ari for a special interview. Political strategist Chai Komanduri and former Watergate prosecutor Nick Akerman join.