President Trump rejected an Israeli plan in recent days to kill Iran's Supreme Leader Ayatollah Ali Khamenei, a senior U.S. official told USA TODAY.

President Donald Trump does not intend to sign onto a joint statement calling for de-escalation between Israel and Iran that had been drafted by G7 leaders in Canada, according to a person familiar with the matter.

The president had opposed Israeli action against Iran but came to believe that Israel had reason to act and that the U.S. would have to lend some support.

President Donald Trump is attending the opening day of the Group of Seven summit Monday in Canada, where some of the staunchest and oldest U.S. allies are expected to discuss tariffs and the escalating military conflict between Israel and Iran — all while attempting to avoid direct confrontations with the mercurial U.

Tehran has asked Qatar, Saudi Arabia and Oman to press U.S. President Donald Trump to use his influence on Israel to agree to an immediate ceasefire with Iran in return for Tehran's flexibility in nuclear negotiations,

The Financial Times' Kim Ghattas and the Carnegie Endowment for International Peace's Karim Sadjadpour join Morning Joe to discuss the latest in Israel and Iran trading direct strikes as conflict escalates.

President Trump urged Iran to return to negotiations over the future of its nuclear program to end conflict with Israel. “They should talk and they should talk immediately before it’s too late,” Trump told reporters on Monday in Canada,

President Trump arrived in Canada for the G7 summit, where the Israel-Iran conflict will be a key issue for world leaders. NBC News' Gabe Gutierrez reports on the possible pressure Trump could face to de-escalate tensions between the countries.

Former Vice President Mike Pence said on “State of the Union” Sunday that if Israel’s attack doesn’t somehow convince Iran to make major concessions in Trump’s diplomatic attempt to end its nuclear program, then the United States should be prepared to join the conflict.

"The full strength and might of the U.S. Armed Forces will come down on you at levels never seen before," Trump warned.

Iran and Israel continued on Sunday their aerial attacks, which began Friday with a series of Israeli strikes on Iran.

Israel’s attack on Iran was long in the making – the result of years of meticulous planning by Israel and days of high-stakes talks between Tel Aviv and Washington, officials told CNN.