From the Pew Research Center: Confidence in election, views of U.S. democracy

Since questions have been raised about the integrity of the electoral process, it might be appropriate to look at the views different groups have towards the norms of democracy.

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Overall, a majority of voters say they have a great deal (32%) or fair amount (32%) of confidence that the presidential election will be open and fair. About one-in-three (35%) say they have little or no confidence the election will be fair and open.

Among Trump supporters, however, most (56%) say they have little or no confidence the election will be fair, while 43% have at least a fair amount of confidence.

Clinton supporters are overwhelmingly confident the election will be fair. Fully 88% of Clinton voters express this view, including 58% who are very confident the election will be fair and open. Among Trump supporters, just 8% have an equally high degree of confidence this will occur.

Voters who support Trump strongly are especially likely to have doubts the election will be fair and open. Nearly two-thirds (63%) say they have little or no confidence the election will be fair, while just 36% have at least a fair amount of confidence in this. Among those who back Trump less strongly, about half (48%) doubt the election will be fair and open. Among Clinton supporters, large majorities of those who support her strongly (92%) and less strongly (84%) express confidence in a fair election.