Sanders, in 1980, joined a Socialist party that supported Iran, among many other positions. The "Geller Report Staff" offers zero evidence that Sanders supported Iran. And the headline of the Jerusalem Post article quoted by the "Geller Report Staff" has an accurate headline, "BERNIE SANDERS WAS IN A PARTY THAT SUPPORTED IRAN DURING HOSTAGE CRISIS".
The "Geller Report Staff" seems to have been less concerned about accuracy. Putting it nicely.