WASHINGTON, DC - SEPTEMBER 01: The soon-to-be-opened Smithsonian National Museum of African American History and Culture is seen during early morning hours September 1, 2016 in Washingotn, DC. The museum was established by Act of Congress in 2003. It is the only national museum devoted exclusively to the documentation of African American life, history, and culture. A dedication ceremony will be held to mark the grand opening of the museum on September 24. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - SEPTEMBER 01: The soon-to-be-opened Smithsonian National Museum of African American History and Culture is seen during early morning hours September 1, 2016 in Washingotn, DC. The museum was established by Act of Congress in 2003. It is the only national museum devoted exclusively to the documentation of African American life, history, and culture. A dedication ceremony will be held to mark the grand opening of the museum on September 24. (Photo by Alex Wong/Getty Images)

(FILES) This file photo taken on March 20, 2005 shows the spires of Healy Hall(top-R) on the Georgetown University campus in Washington, DC as seen from the George Washington Parkway(bottom) looking past the Key Bridge(C) in Virginia. Georgetown University on on September 1, 2016 announced measures to atone for having profited from the sale of nearly 300 slaves in the 19th century, giving an edge in admissions for their descendants. The US university's president, John DeGioia, will discuss the steps in a speech later Thursday, and is to offer a formal apology. Georgetown, a Jesuit school founded in 1789 in the US capital Washington, is one of the oldest universities in the United States. / AFP PHOTO / KAREN BLEIERKAREN BLEIER/AFP/Getty Images

(FILES) This file photo taken on September 30, 2011 shows Healy Hall, the flagship building of Georgetown University's main campus in Washington, DC. Georgetown University on on September 1, 2016 announced measures to atone for having profited from the sale of nearly 300 slaves in the 19th century, giving an edge in admissions for their descendants. The US university's president, John DeGioia, will discuss the steps in a speech later Thursday, and is to offer a formal apology. Georgetown, a Jesuit school founded in 1789 in the US capital Washington, is one of the oldest universities in the United States. / AFP PHOTO / MLADEN ANTONOVMLADEN ANTONOV/AFP/Getty Images

TO GO WITH AFP STORY BY MARIA PANINA (FILES) This file photo taken on July 7, 2009 shows US President Barack Obama (L) and former Russian Prime Minister and current Russia's President Vladimir Putin meeting at the latter's country residence home in Novo Ogaryovo, near Moscow. The G20 summit starting in China on September 4, 2016 gives Russian President Vladimir Putin one more chance to try to strongarm US leader Barack Obama over Syria and Ukraine as their fraught relationship nears an end. In recent years the two world leaders have barely been able to hide their disdain for each other as ties between Washington and Moscow fell to their lowest level since the Cold War over the crisis in Ukraine. Now with elections for a new US president just over two months away, Russian analysts say an emboldened Putin could see the G20 as an opportunity to press for concessions from Obama, particularly on Syria if he wants to make progress on the war before leaving office. / AFP PHOTO / SAUL LOEBSAUL LOEB/AFP/Getty Images

TO GO WITH AFP STORY BY MARIA PANINA (FILES) This file photo taken on September 6, 2013 shows Russias President Vladimir Putin (L) walking past US President Barack Obama during the G20 summit in Saint Petersburg. The G20 summit starting in China on September 4, 2016 gives Russian President Vladimir Putin one more chance to try to strongarm US leader Barack Obama over Syria and Ukraine as their fraught relationship nears an end. In recent years the two world leaders have barely been able to hide their disdain for each other as ties between Washington and Moscow fell to their lowest level since the Cold War over the crisis in Ukraine. Now with elections for a new US president just over two months away, Russian analysts say an emboldened Putin could see the G20 as an opportunity to press for concessions from Obama, particularly on Syria if he wants to make progress on the war before leaving office. / AFP PHOTO / KIRILL KUDRYAVTSEVKIRILL KUDRYAVTSEV/AFP/Getty Images

TO GO WITH AFP STORY BY MARIA PANINA (FILES) This file photo taken on September 05, 2013 shows Russias President Vladimir Putin (L) welcoming US President Barack Obama at the start of the G20 summit in Saint Petersburg. The G20 summit starting in China on September 4, 2016 gives Russian President Vladimir Putin one more chance to try to strongarm US leader Barack Obama over Syria and Ukraine as their fraught relationship nears an end. In recent years the two world leaders have barely been able to hide their disdain for each other as ties between Washington and Moscow fell to their lowest level since the Cold War over the crisis in Ukraine. Now with elections for a new US president just over two months away, Russian analysts say an emboldened Putin could see the G20 as an opportunity to press for concessions from Obama, particularly on Syria if he wants to make progress on the war before leaving office. / AFP PHOTO / POOL / Pablo MARTINEZ MONSIVAISPABLO MARTINEZ MONSIVAIS/AFP/Getty Images

TO GO WITH AFP STORY BY MARIA PANINA (FILES) This file photo taken on September 5, 2013 shows Russias President Vladimir Putin (L) welcoming US President Barack Obama at the start of the G20 summit in Saint Petersburg. The G20 summit starting in China on September 4, 2016 gives Russian President Vladimir Putin one more chance to try to strongarm US leader Barack Obama over Syria and Ukraine as their fraught relationship nears an end. In recent years the two world leaders have barely been able to hide their disdain for each other as ties between Washington and Moscow fell to their lowest level since the Cold War over the crisis in Ukraine. Now with elections for a new US president just over two months away, Russian analysts say an emboldened Putin could see the G20 as an opportunity to press for concessions from Obama, particularly on Syria if he wants to make progress on the war before leaving office. / AFP PHOTO / ALEXANDER NEMENOVALEXANDER NEMENOV/AFP/Getty Images