President Donald Trump arrived in Washington, D.C., early Tuesday morning after abruptly leaving the G7 summit in Canada to address the escalating conflict between Israel and Iran.

Trump arrived at the White House early Tuesday at a moment of choosing in his presidency. Israel, with five days of missile strikes, has done considerable damage to Iran and believes it can now deal a permanent blow to Tehran’s nuclear program — particularly if it gets a little more help from the Republican president.

World leaders meeting at the Group of Seven summit in Canada called for a de-escalation of the worst-ever conflict between the regional foes.