Is Trump undermining US democracy?

Now, however, he's calling into question one of the foundations of US democracy - the legitimacy of its electoral process.

In the fever swamps on the left and the right, plenty of Americans have doubted the integrity of US elections.

They've levelled accusations of voter fraud. Or hacked voting machines. Or polling-place intimidation.

Some of the allegations even contain kernels of truth.

Many US voting electronic machines are woefully unsecure and produce no hard-copy backup. There have been instances of voter impersonation - although they're extremely isolated and usually involve absentee balloting. New Black Panther activity around Pennsylvania polling sites in 2008 inflamed conservatives, although a US Justice Department investigation found no illegal activity.

You don't have to dig too deep into social media or the partisan commentariat to find a thorough rehashing of any of these particular concerns. What you don't hear - at least not until now - is such accusations coming from the top of a presidential ticket.
At a rally on Monday Mr Trump said he was afraid that the November election "is going to be rigged" - backing up his statement by saying it was something he was hearing "more and more".

http://www.bbc.com/news/election-us-2016-36960218