The Ku Klux Klan has not existed, in any meaningful form, since the late 1980s at the latest.
All that exists now, are a scattering of small, unconnected groups, claiming come connection or another to the KKK, and going by variants of that name.
They are nothing.
And even if it was true that every single member of every one of these groups was registered as a Republican, their numbers would be nothing compared to the number of registered Republicans.
For all intents and purposes, the only existence that the KKK has had for the last thirty or forty years has been as an ephemeral bogyman, that the Democraps created, and by which the Democraps now use to try to smear their opponents by false association.