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

It follows daytime attacks from both sides, with Israeli strikes in Tehran continuing and Iran firing more missiles towards Israel.

KANANASKIS, Alberta — Leaders of some of the world’s biggest economic powers arrive in the Canadian Rockies on Sunday for a Group of Seven summit, overshadowed by an escalating conflict between Israel and Iran and U.S. President Donald Trump’s unresolved trade war with allies and rivals alike.

MOSCOW − Russian President Vladimir Putin spoke to Donald Trump for 50 minutes on June 14, condemning the Israeli military operation against Iran and expressing concern about the risks of escalation, the Kremlin said.

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.

Israel's bombing of Iranian targets ignites political clash as Democrats, Republicans, and media figures debate Netanyahu's actions and Trump's Middle East influence

President Trump is trapped between the “America First” isolationists and others in his party who are cheering on Israel’s strikes against Iran.

In response to Israel’s attack, Iran fired back with more than 100 drones. NBC News’ Chief International Correspondent Keir Simmons reports more. Former NATO Supreme Allied Commander retired Gen. Wesley Clark and Senior Fellow at the Carnegie Endowment for International Peace Aaron David Miller join Ana Cabrera to examine the possibility of further attacks.