NATO NATO

President Trump speaks with Turkish President Recep Tayyip Erdogan during a tour of the new NATO headquarters last month in Brussels, Belgium. Despite their alliance, the U.S. and Turkey have experienced escalating friction in recent weeks. Tatyana Zenkovich/AP hide caption

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Tatyana Zenkovich/AP

Montenegro's President Milo Djukanovic arrives for a summit of heads of state and government at NATO headquarters in Brussels earlier this month. Francois Mori/AP hide caption

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Francois Mori/AP

German Chancellor Angela Merkel (front left), Belgian Prime Minister Charles Michel, NATO Secretary-General Jens Stoltenberg, President Trump and British Prime Minister Theresa May attend the opening ceremony at the NATO summit Tuesday in Brussels. Sean Gallup/Getty Images hide caption

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Sean Gallup/Getty Images

A U.S. Navy senior chief petty officer stands watch ahead of a ceremony inaugurating the U.S. anti-missile station Aegis Ashore Romania at Deveselu, Romania, in 2016. The station is part of NATO's anti-missile shield for Europe. Daniel Mihailescu/AFP/Getty Images hide caption

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Daniel Mihailescu/AFP/Getty Images

FACT CHECK: Trump's Claims On NATO Spending

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President Trump arrives at the NATO summit in Brussels. The House is scheduled to take up a measure Wednesday reaffirming U.S. support for NATO; the Senate approved a similar measure Tuesday. Brendan Smialowski /AFP/Getty Images hide caption

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Brendan Smialowski /AFP/Getty Images

In what was supposed to be a brief photo op ahead of a breakfast meeting, President Trump launched a verbal attack against NATO defense spending as cameras clicked away. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP

British Prime Minister Theresa May, U.S. President Trump and NATO Secretary-General Jens Stoltenberg listen to Belgian Prime Minister Charles Michel speak during a NATO summit in Brussels on May 25, 2017. Matt Dunham/AP hide caption

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Matt Dunham/AP

'No One Wants To Look Like Trump's Poodle': NATO Allies Gear Up For Brussels Summit

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Journalists set up in front of the U.S. Supreme Court building on Monday in anticipation of President Trump's announcing his next Supreme Court nomination Monday evening. Tasos Katopodis/Getty Images hide caption

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Tasos Katopodis/Getty Images

Air Force One waits after landing in Bagotville, Canada, in June. At the G-7 meeting there, President Trump threw traditional U.S. allies into disarray over his trade and security policies. Lars Hagberg/AFP/Getty Images hide caption

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Lars Hagberg/AFP/Getty Images

Stung By Trump At G-7, Allies Look For Better Outcome At NATO Summit

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Macedonia will now be named Republic of North Macedonia after its prime minister reached an agreement with his Greek counterpart. A monument to Alexander the Great is seen in the center of Skopje on Sunday. Robert Atanasovski/AFP/Getty Images hide caption

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Robert Atanasovski/AFP/Getty Images

President Donald Trump speaks during a news conference with German Chancellor Angela Merkel in the East Room of the White House on Friday. Evan Vucci/AP hide caption

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Evan Vucci/AP

Merkel's Low-Key Visit With Trump Focuses On Trade, Foreign Policy

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Left to right: Latvian President Raimonds Vejonis, Estonian President Kersti Kaljulaid, Lithuanian President Dalia Grybauskaite and U.S. President Donald Trump, hold a joint news conference in the East Room of the White House Tuesday. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

NATO Secretary-General Jens Stoltenberg speaks during a news conference to announce the withdraw of accreditation for staffers of Russia's Mission to NATO, in Brussels on Tuesday. Anadolu Agency/Getty Images hide caption

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Anadolu Agency/Getty Images

U.S. Army Gen. John Nicholson told the Senate Armed Services Committee in February that the war in Afghanistan was at a "stalemate." Alex Wong/Getty Images hide caption

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Alex Wong/Getty Images

'The Taliban Can't Win,' Says Commander Of U.S. Forces In Afghanistan

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An American helicopter hovers over a NATO convoy struck by a suicide bomb Wednesday. The Pentagon says the attack, which unfolded near the southern Afghan city of Kandahar, killed two U.S. service members. STR/AP hide caption

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STR/AP

President Donald Trump and British Prime Minister Theresa May await a photo opportunity at a NATO summit meeting in Brussels on Thursday. Dan Kitwood/Getty Images hide caption

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Dan Kitwood/Getty Images

German Chancellor Angela Merkel and former President of the United States Barack Obama arrive for a discussion on democracy in Berlin Thursday. Steffi Loos/Getty Images hide caption

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Steffi Loos/Getty Images