Defense Secretary Jim Mattis seems to be aiming to reassure U.S. allies while overseas. Ahead of an unannounced visit to Iraq, Mattis rejected President Trump's statements that the U.S. should have seized Iraqi oil after the invasion. Susan Walsh/AP hide caption

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A fighter of the Hashed al-Shaabi (Popular Mobilization) paramilitaries stands guard near the front-line village of Ayn al-Hisan, west of Mosul, where Iraqi forces were preparing to launch an offensive to retake the western side of the city from the Islamic State. Ahmad Al-Rubaye/AFP/Getty Images hide caption

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An Iraqi soldier on Sunday stands near a makeshift armored car left behind by the Islamic State when they were driven out of the eastern side of Mosul. President Trump has ordered the U.S. military to draw up a new plan for the fight against ISIS. Mstyslav Chernov/AP hide caption

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Demonstrators at Dallas-Fort Worth International Airport gather on Saturday to protest President Trump's executive order temporarily barred refugees and citizens of seven countries. G. Morty Ortega/Getty Images hide caption

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Students at Mosul University place the Iraqi national flag at the entrance on Sunday after it was liberated from Islamic State militants. The Iraqi military, supported by the U.S., has retaken the eastern part of the city. ISIS still holds the western part of Mosul, its last major stronghold in Iraq. Khalid Mohammed/AP hide caption

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Khalid Mohammed/AP

One of the 8,400 remaining U.S. troops in Afghanistan guards the bay of a CH-47 Chinook transport helicopter as it flies near Kabul. David Welna/NPR hide caption

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David Welna/NPR

After 8 Years Of Unbroken War, Obama Hands Over Conflicts To Trump

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A member of the Iraqi special forces' Counter-Terrorism Service stands guard next to a damaged building at Mosul university on Sunday, during an ongoing military operation against the Islamic State. Dimitar Dilkoff/AFP/Getty Images hide caption

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Men push a cart at a makeshift river crossing next to a bridge destroyed by Islamic State militants in Mosul, Iraq, on Thursday. The Iraqi forces have reclaimed much of eastern Mosul, but the Islamic State still controls much of the western side of the city. Khalid Mohammed/AP hide caption

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Khalid Mohammed/AP

Khoshaba Jaber, an Assyrian living in West London, plays a tambura, a traditional instrument known as the "mother of strings," after singing an epic poem he learned in his boyhood village in northern Iraq. Alice Fordham/NPR hide caption

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In England, An Effort To Preserve Ancient, Epic Assyrian Poetry

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Yacoub Youssef, in charge of the small city of Jalawla in northern Iraq, stands on a bridge rebuilt by residents after it was blown up by ISIS. The city was heavily damaged and is in disputed territory – claimed by both the Iraqi and Kurdish governments. Jane Arraf/NPR hide caption

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In Disputed Iraqi Territory, Rebuilding A City Means Doing It Yourself

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Four Iraqi commandos at the base were among those awarded medals by Defense Secretary Ash Carter during his visit earlier this month. David Welna/NPR hide caption

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Defense Secretary Ash Carter Predicts 'Tough Fight' Ahead To Retake Mosul

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