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Russian Foreign Minister Sergey Lavrov (left) and Russian Ambassador to the U.S. Sergey Kislyak met with President Trump last week in the Oval Office. Alexander Shcherbak/TASS/Getty Images hide caption

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Former Director of National Intelligence James Clapper and former U.S. Deputy Attorney General Sally Yates testify before the Senate Judiciary Committee's Subcommittee on Crime and Terrorism on Capitol Hill on Monday. Eric Thayer/Getty Images hide caption

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"What the American Founding Fathers understood was that institutions were built for human imperfection, not human perfection," Condoleezza Rice says. Ariel Zambelich/NPR hide caption

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Ariel Zambelich/NPR

Condoleezza Rice Reflects On The State Of Democracy

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A statue of the Greek writer Thucydides sits outside the Austrian capital in Vienna. More than 2,000 years ago, he noted the friction that led to war between an established power, Sparta, and a rising power, Athens. A new book by Harvard professor Graham Allison makes a comparison with the relationship between the U.S. and China. vladacanon/Getty Images/iStockphoto hide caption

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vladacanon/Getty Images/iStockphoto

From Ancient Greece, Lessons On The Risk Of A Modern, Accidental War

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Then-Deputy Attorney General Sally Yates speaks during a news conference at the Department of Justice in Washington, D.C., in 2016. Yates is scheduled to appear before the Senate Judiciary Committee on May 8. Pete Marovich/Getty Images hide caption

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Former New York Times journalist Judith Miller along with her legal team including Robert Bennett, right, leaves U.S. District Court in Washington in 2007. Miller was jailed for nearly three months after refusing to testify in a CIA leak investigation. Kevin Wolf/AP hide caption

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Kevin Wolf/AP

Top House Democrats, including Rep. Elijah Cummings, D-Md. (at the podium), said this week they want an investigation into President Trump's connections with Russia, such as when he learned that his national security adviser, Michael Flynn, had discussed U.S. sanctions with a Russian diplomat. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP

In a 2015 YouTube video released by al-Qaida in the Arabian Peninsula, commander Nasr al-Ansi claims responsibility for the attack on the French satirical magazine Charlie Hebdo. The U.S. military has stepped up attacks on the group in the past month. Daily Motion hide caption

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Daily Motion

U.S. Ramps Up Its Fight Against Al-Qaida In Yemen

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President Trump's address to a joint session of Congress on Tuesday night is expected to strike a more optimistic tone than his inaugural address did last month. Alex Wong/Getty Images hide caption

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Lt. Gen. H.R. McMaster looks on as President Trump announces him as his national security adviser at Trump's Mar-a-Lago resort in Palm Beach, Fla., on Monday. Nicholas Kamm/AFP/Getty Images hide caption

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New Trump Adviser H.R. McMaster Faces An Old Challenge — Iraq

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President Trump hosts Japanese Prime Minister Shinzo Abe at Mar-a-Lago in Palm Beach, Fla., on Feb. 10. North Korea tested a missile during Abe's visit last weekend, one of several provocative actions by U.S. rivals during the first month of Trump's presidency. Susan Walsh/AP hide caption

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Susan Walsh/AP

U.S. Secretary of Defense Chuck Hagel (left) walks with Vice Adm. Robert Harward (center), the deputy commander of U.S. Central Command, and Col. Kelly Martin, the vice commander of 6th Air Mobility Wing, after landing at MacDill Air Force Base in Tampa, Fla., in 2013. Erin A. Kirk-Cuomo/DoD hide caption

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Erin A. Kirk-Cuomo/DoD

President Trump speaks on the phone in the Oval Office with now-former national security adviser Michael Flynn (center) and White House chief strategist Steve Bannon on Jan. 28. Drew Angerer/Getty Images hide caption

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Then-deputy director of CENTCOM, U.S. Navy Vice Admiral Robert Harward, is pictured with Jordan's Prince Faisal and the Army's head of operations and training Major General Awni Adwan in a May 2012 photo. Harward is now under consideration to replace Michael Flynn as President Trump's national security adviser. Khalil Mazraawi /AFP/Getty Images hide caption

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Then-national security adviser Michael Flynn, senior adviser Jared Kushner and President Trump. Flynn pleaded guilty to lying to the FBI. Now, the focus moves to what he told investigators. Brendan Smialowski/AFP/Getty Images hide caption

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Brendan Smialowski/AFP/Getty Images

National security adviser Michael Flynn has resigned amid allegations he misled then-Vice President-elect Pence about the extent of a conversation he had with the Russian ambassador. Carolyn Kaster/AP hide caption

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Carolyn Kaster/AP

President Trump is embroiled in a defense of a Jan. 29 Yemen raid he ordered. He and his White House have described it as a success, but Sen. John McCain called it a "failure." Pool/Getty Images hide caption

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Pool/Getty Images