Vice President Mike Pence says Donald Trump is “seriously considering” moving the U.S. embassy in Israel from Tel Aviv to Jerusalem, a move that would reverse six decades of American policy in the Middle East and inflame tensions in the Arab world.

Speaking at a Washington event Tuesday celebrating the anniversary of Israel’s Declaration of Independence in 1948, Pence pointed to the White House’s close relationship with the country and lauded Trump’s record on Israel since he assumed the presidency.

He cited the appointment of David Friedman as U.S. ambassador to Israel and Nikki Haley as U.S. ambassador to the United Nations of evidence of Trump’s support to Israeli, according to White House transcripts.