The Pentagon launched an airstrike Thursday night that killed a powerful Iranian military leader, Gen. Qasem Soleimani, at Baghdad’s international airport.

The Defense Department said it conducted the attack at President Donald Trump’s direction as a “defensive action” against Soleimani, who it said was planning further attacks on American diplomats and service members.

Soleimani is an extremely influential figure inside Iran, heading Iran’s elite Quds Force, part of the country’s hard-line paramilitary Revolutionary Guard Corps.