The Quds Force is Iran’s elite special force — somewhat like the Navy SEALs in the U.S. While secretive, they are known to support Iranian proxies such as Shiite militias in Syria and Iraq and Hezbollah in Lebanon. They’re headed by Gen. Qasem Soleimani, a name Trump doesn’t seem to recognize.

The Kurds are an ethnic group found in Iran, Iraq, Syria and, most prominently, Turkey. Although a Turkey-based group called the Kurdistan Worker’s Party is considered a terrorist organization by the U.S., the People’s Protection Units in Syria have cooperated with the U.S. in operations against ISIS. Ostensibly, Trump misheard Hewitt during the interview and thought he said Kurds, not Quds.

The U.S. has been fairly effective in assisting the Kurds in both Iraq and Syria, though it’s been reluctant to bypass the Iraqi government in Baghdad to directly arm Kurdish Peshmerga fighters in Iraq.

Hamas is a U.S.-designated terrorist organization that operates primarily within the Palestinian territories. It governs the Gaza Strip. Hezbollah is a militant group and political party in Lebanon that’s also considered a terrorist organization. Its fighters are also participating in the Syrian conflict on the side of the Assad regime.

Those are the major differences between the two, but Hezbollah also has more direct support from Iran and is a Shiite group. Hamas is more predominantly Sunni. It also has many more skirmishes with the Israeli Defense Forces than Hezbollah, which only occasionally clashes with Israel.