I feel like Newt and Rudy and/or Huckabee (all who I have vast respect for and would hope they would just let Trump be Trump) pressured him to do an endorsement of Paul Ryan and are pushing him to be positive more which is also a dumb move when there is so much about the Clintons people dont know yet...
Why does Giuliani care?
I doubt that Rudy had anything at all to do with this, bit others sure did.