Bahrain joined the United Arab Emirates in agreeing to normalize relations with Israel on Friday, a move forged partly through shared fears of Iran but one that could leave the Palestinians further isolated.

U.S. President Donald Trump posted the announcement on Twitter after he spoke by phone, according to the White House, to Bahrain's King Hamad bin Isa Al Khalifa and Israeli Prime Minister Benjamin Netanyahu.

"This is truly a historic day," Trump told reporters in the Oval Office, saying he believed other countries would follow suit.