OK, he supported Gabbard, but not Sanders ....
I suppose Duke is one example of a far right type. He's probably more correctly termed a white supremacist anti-Semite of course. That alone doesn't make him "far right", depending on how one views the term, and of course he could well have done this for attention.
“Tulsi Gabbard is currently the only Presidential candidate who doesn’t want to send White children off to die for Israel,” the former Grand Wizard tweeted his more than 50,000 followers along with a photograph of Gabbard meeting a US service member and his child.
I suspect the "far right" is not homogeneous, which is of course typical of extremists, the right-left scale isn't adequate. The term to me means anyone who is completely intolerant of others and wants the country to be entirely white and straight and homogeneous, or at least their part of it, with guns for everyone and small government like we had in 1820.
Le Pen is considered pretty far right in France, but she's a socialist, or claims to be, just mostly anti-immigrant, which I find many French are in their homes. It's sort of eye opening to hear very well educated French men being so anti-immigrant in private.