“A wedge issue is a rhetorical strategy, usually focused on a social concern, that is intentionally constructed to divide party voters and polarize the public in order to gain political advantage. Often gaining currency through the media, such issues may be considered to coarsen political discourse by exploiting factions.

“The author suggests that one role of the rhetorician [is] to explain these issues to the public so that voters will become more aware of how they may be manipulated”.

Source: Southern Communication Journal: Vol 67, No 3

Source: iPolitics

In this wedge, Clinton claims the KKK supports Trump: https://twitter.com/HillaryClinton/status/768823064033308673

However, the Washington Times reported that:

Klan leader claims KKK has given $20K to Clinton campaign

‘For the KKK, Clinton is our choice’

Source: Washington Times