Senator Bernie Sanders appeared on Jimmy Kimmel Live one night after the possibility of a Trump -vs- Sanders debate was proposed and Trump being open to it.
Unfortunately, Democrat party rules forbid any Democrat candidate from participating in unsanctioned debates, so it would be challenging to pull it off. In addition the DNC is fully supporting Hillary Clinton to the diminishment of Sanders; so no help there.
However, that said, Bernie sees an opening to marginalize his opponent Hillary, and Trump is a rogue and happy wolverine – so perhaps anything is possible.
Also in the video, Bernie is none to happy with Clinton appointing herself the winner of the Democrat race.  As The Bern says: “there’s a little bit of arrogance there”.  Gee, ya think?: