So basically he is afraid of more people voting? Like how is a election where more people then ever vote rigged? Like wtf.
This might fall in line with the analysis of <forgot name sorry> which claimed that election results are more based on which people vote and which don't then on swing voters and that swing voters are pretty much irrelevant.
If this is true and it turns out that an majority of voters in the US is more on the side of the democrats then a voting method which makes more people vote could indeed cause a long term defeat of the republicans in a fair democratic non rigged manner!