Who are the Kurds and why does Trump want them to join the war on Iran?

A nationless ethnic group of more than 30 million people, their homegrown militia has a reputation as effective fighting force The Kurds are one of the biggest ethnic groups in the world without their own nation. Numbering between 30 and 40 million worldwide, most live amid the peaks and valleys straddling the borders of Armenia, Iraq, Iran, Syria and Turkey. The Kurds link their history to that of the Medes, an ancient Middle Eastern people.