Green Party leader Natalie Bennett said she backed the boycott of Israeli artists, musicians and academics in an interview with the JC on Friday.
Ms Bennett, who is standing for Holborn & St Pancras, supported the party’s official Israel boycott policy.
She said: “We need to get the message across to the Israeli state. It needs to comply with international law and human rights.
“The boycott of Israel is Green Party policy. It is a really difficult area, but I would support the policy.”
The Green Party manifesto, which was released this week, called for the suspension of the EU-Israel Association Agreement, which is worth more than £1 billion a year.
Ms Bennett, who has never been to Israel or the West Bank, said: “That agreement should be contingent on respecting human rights and international law. Until Israel is in compliance with international law, I don’t think we should have that trade deal.
“I believe we should stop arms sale to Israel. I believe that we should be using diplomatic pressure to push Israel to respect international law and UN resolutions...I believe we should point out that the environmental movement is a type of totalitarianism and that Ms Bennett's "green" Zionhass is obscene.