did not hold back against his democratic rival today. releasing a new television ad questioning whether clinton is physically fit to be president. >> hillary clinton failed every single time as secretary of state. now she wants to be president. hillary clinton doesn't have the fortitude, strength or stamina to lead in our world. >> reporter: all as trump repeatedly vows to throw clinton in jail if he wins in november. >> special prosecutor here we come, right? >> reporter: former attorney general michael mukasey, a republican who has been critical of clinton's e-mail practices broke with trump, saying america isn't a country that throws its political enemies in jail adding, it would be like a banana republic. but trump has increasingly embraced the angry chants of his crowds. >> crooked hillary clinton is as crooked as a $3 bill. i would look her up is right. >> reporter: in a radio