The former governor of California was due to show the couple improvements the state has made over green issues during their three-day official stay in July.
But aides are now in crisis talks over fears the sex scandal could engulf the entire visit.
"There is a very big question mark over whether the former governor can be part of the visit now, or if he'd want to be," the Daily star quoted one royal retainer as sayimg.
"This clearly isn't going to go away in a few weeks," the royal retainer added.
A royal aide added: "His presence is now very difficult for the Duke and Duchess of Cambridge but, of course, it is a matter for their hosts to make a decision on." (ANI)
