"Do you think the presidential election is rigged like Donald Trump suggests?"
Of course not.
The impetus for Trump claiming the election, lo "the whole system," is rigged is purely for the purpose of Trump being able to ascribe position his loss not to his own failings and shortcomings, but rather to something other than himself.
As we all know, for Trump, everything, literally, is about winning and losing. If he loses "because the system is rigged," then it's not his fault; there's nothing he did wrong. If he loses due to the collusion of others against him, he didn't let anyone down, those who colluded against him did.
Sidebar:
With regard to Trump's supporters, they routinely claim that Donald Trump speaks his mind, that he tells it like it is. Well, how is it that the man who speaks his mind did so on a bus with Billy Bush, and we are not to believe him, particularly when multiple women come forth and say, "Yep. The behavior he described on that bus with Mr. Bush is precisely how he comported himself with me."?
Quite simply, one cannot simultaneously be frank, plain spoken and "telling it like it is" honest in the sense that Trump has presented himself and that his supporters claim they believe him to be, and be also not to be believed when one says whatever one says about oneself and one's attitudes. It's not as though on that bus Trump was describing how he perceived someone else to be; he was talking about himself and how it is in "Trumpland."
End of sidebar.