In the vast and complex Israeli-Palestinian conflict, one issue is particularly contentious: Jewish Israeli settlers living in the West Bank, territory Israel has held since the Six-Day War in 1967. As the 50th anniversary of that conflict approaches in June, it continues to complicate the relationship between the U.S. and Israel. Donald Trump visits Israel this week, but ahead of his visit, an American diplomatic aide reportedly challenged Israel's claim to the Western Wall, a holy site that has been contested since the 1967 conflict. Trump touted his support for Israel during the campaign, but has cooled on the settlements, telling an Israeli newspaper in February that they “don't help the [peace] process.” On the other hand, Trump's newly arrived U.S. ambassador to Israel, David Friedman, has strongly supported the settlement movement, and members of his family helped found Bet El, one of the West Bank communities.