Social activist Teesta Setalvad, addressing a press conference here, compared "Trump declaration" to the Balfour Declaration whereby Britain "gifted Palestine to the Jewish people" a century ago.
The Forum called Trump's decision as another glaring instance of US' arrogance.
It goes against an international consensus and framework of UN resolutions and international laws, it said.
National General Secretary of the Forum Feroze Mithiborwala said they were more concerned by the "utter silence" of the Narendra Modi government on the issue.
"PM Modi's affinity to Israel may see a further diminishing global role for our country, as India moves deeper into the US-Israeli camp. This will be a betrayal of all that India stands for, a betrayal of the legacy of our anti-colonial freedom struggle and the moral values on which modern India was built," Mithiborwala said.
Communist leader Prakash Reddy said on this occasion, "The Trump Declaration on its part is leading to tectonic shifts across the region and therefore."
The US now stands isolated, and the decision has weakening the US' role in the Middle-East and across the world, he said.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)