"It seems to me that the Palestinians have decided that the United States is no longer an honest broker in the MidEast peace process between the Palestinians and Israelis", he said, adding that it will likely lead to further Palestinian rage and resistance.
Most countries say the status of Jerusalem - a sacred city to Jews, Muslims and Christians - should be determined in a final peace settlement and that moving their embassies now would prejudge any such deal.
Likewise, Mr. Trump's aides also made no direct reference to the climbing death toll. Representing the First Family are Trump's daughter Ivanka and her husband, Kushner, both of whom are Jewish and hold official positions in the White House. "T his President delivered", said Kushner.
Israeli Prime Minister Benjamin Netanyahu also spoke at the event: "What a glorious day-remember this moment!"
The Russian government said it feared the embassy move would increase tensions across the Middle East.
"The United States recognizes the sensitivity surrounding Jerusalem, a city that means so much to so many", he said.
"As I said in December, our greatest hope is for peace", he added.
The U.S. delegation was welcomed by Netanyahu and his wife Sunday night with a gala.
Prime Minister Benjamin Netanyahu, in lockstep with Trump over fulfilling a long-standing US promise to move the embassy to the holy city and over Washington's withdrawal from the Iran nuclear deal last week, hailed the move.
Black smoke from tyres burned by demonstrators rose into the air at the border.
Thousands of Palestinian protesters attempted to breach the border fence between Gaza and Israeli territory, hurling rocks and flaming tires, and were turned back by Israeli tear gas and live rifle fire.
While attendees toasted the historic opening, thousands of protesters clashed with Israeli forces in Gaza.
But the largest demonstrations began Monday in the coastal enclave of Gaza, where there has already been several weeks of unrest with dozens of Palestinians killed by Israeli soldiers and more than 2,000 wounded.
But Kushner's comments - a rarity in themselves, given his infrequent public appearances - came shortly after violence erupted at the Israel-Gaza border. "Yet or many years we failed to acknowledge the obvious, the plain reality that Israel's capital is Jerusalem".
"The U.S. will always be a great friend of Israel and a partner in the cause of freedom and peace".
Nabeel Shaath, a long-time Palestinian peace negotiator, thinks Trump set the peace process back.
New Yorkers in Jerusalem seemed pleased with Trump's decision.
"Only President Trump could pull it off in the the political climate we have in the states", New Hempstead resident Yossi Gold said.