Here's the relevant part of his Wikipedia article:

Harris opposes Israel's right to exist as a Jewish state and Jewish claims of ownership made in the Bible. Despite this, Harris has said due to the hostility towards Jews, he has conceded that if there is one religious group which needs protections in the form of a state, it is Israel.[72][73]

With regard to the Israeli–Palestinian conflict, he has criticized both Israel and Palestine for committing war crimes. He has indicated that he believes that Israel genuinely wants peace and that its neighbours are more devoted to the destruction of Israel.[74] Harris has also said that Palestine is more guilty, citing Palestine and Hamas' use of human shields and genocidal rhetoric towards the Jews as reasons Palestine is more morally culpable.[75] He names these as reasons that Israel has a right to defend itself against Palestine.[76]