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Library picture: Al Udeid Air Base, 1 December 2015. Photo credit: US Air Force/Tech Sgt Nathan Lipscomb 

Prime minister Adel Abdul-Mahdi could now take back the invitation that allows 6,000 troops to currently stay in Iraq. 

While the U.S. presence in Iraq is sizable, other Middle Eastern countries host many more U.S. troops. The largest U.S. base in the Middle East is in Qatar. The country hosts around 13,000 U.S. troops, according to numbers compiled by the Washington Post.

Located southwest of Doha, Al Udeid Air Base has proven crucial in the fight against ISIS. Qatar invested $1 billion in constructing the base and it's also home to the U.S. Combined Air Operations Center, responsible for coordinating U.S. and allied air power across the Middle East, particularly in airspace over Iraq, Syria and Afghanistan. 

The following infographic highlights just how important Qatar, along with Kuwait, is to the U.S. presence in the Middle East. Both countries hosts an estimated 13,000 U.S. troops. Neighboring Bahrain is also vital to American interests in the region, home to the Naval Support Activity Bahrain, the U.S. Fifth Fleet and a substantial military presence at Isa Air Base. 7,000 troops are based there. 

U.S. troops have been withdrawing from Syria after the Trump administration's decision in October, which has decimated their numbers from an estimated 2,000 in September to currently around 800.

This chart shows the estimated number of U.S. troops based in Middle Eastern countries.

This article and chart originally appeared on the blog of Statista, a data firm, and is republished with permission.