CONFLICT ENTERS FOURTH DAY: Israel and Iran have begun a new round of attacks, as the conflict between the two heavily armed rivals enters its fourth day.

It’s a tableau no world leader — except perhaps President Donald Trump — wants to repeat. Convening in the Canadian Rockies for this week’s Group of 7 summit, presidents and prime ministers are hoping to avoid the acrimony that pervaded the last time this country played host to the world’s most exclusive club.

Israel and Iran both have little incentive to stop and no obvious route to outright victory. Much depends on President Trump.

Iran launched a new wave of missile attacks on Israel early Monday, setting off air raid sirens nationwide as emergency services reported at least five dead and dozens wounded. Follow along for live updates.

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.

A Democratic senator introduced legislation on Monday to prevent U.S. President Donald Trump from using military force against Iran without Congress's authorization, as an escalating battle between Israel and Iran raised fears of broader conflict.

President Donald Trump said the United will come down on Iran “at levels never seen before” if the Middle Eastern country attacks.

Netanyahu reveals Iran attempted to assassinate both him and Trump, discusses Israel's strikes against Iran's nuclear program, and explains the "imminent threat."