UK Labour leader Jeremy Corbyn is set to take the stage alongside Hamas supporter Anas Altikriti, at the Stop the War coalition's conference in London next month. regrets supporting Hamas and Hezbollah, and that comments by former London Mayor Ken Livingstone asserting that Hitler supported Zionism were “wrong.” Corbyn is not new to the Stop the War coalition, which was founded shortly after the September 11th, 2001 terror attack in New York, and formed against the war in Afghanistan and other conflicts in the Middle East. The Labour leader served as the chairman of Stop the War from 2011 to 2015. He left the position after being elected leader of the UK Labour party. Corbyn's continued support of the group has come under fire after attending their Christmas fundraiser in December of 2015, shortly after the group made controversial statements on Syria. At the time of the Christmas dinner, some who used to support the group, including Green Party MP Caroline Lucas, had already begun to question the group and their lack of support for Democratic groups that are against Syrian President Bashar Assad, according to The Guardian. It wasn't the first time the group has made controversial statements on Syria. According to The Independent Stop the War published a statement praising the "internationalism and solidarity" of the Islamic State. The statement has since been removed. Corbyn previously angered the Jewish community by calling Hamas and Hezbollah terrorists friends and by publicly endorsing a blanket arms embargo on Israel. Corbyn has also supported the boycott of Israeli universities involved in weapons research. He has come under increasing pressure to make amends with the Jewish community since he won the Labor leadership race September 12, 2015. Gil Hoffman and JTA contributed to this report.