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:US President Barack Obama speaks on the situation in Iraq and in Ferguson, Missouri, at Martha's Vineyard, Massachusetts, on August 14, 2014. Obama called Thursday for 'peace and calm' in the Missouri town where the police shooting of an unarmed black youth has sparked angry protests. Obama lamented the 'heartbreaking' death of Michael Brown, an 18-year-old killed Saturday in Ferguson but urged both police and protesters to refrain from violence. 'Now is the time for peace and calm on the streets of Ferguson,' he told reporters. AFP PHOTO/Nicholas KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Image
:US President Barack Obama speaks on the situation in Iraq and in Ferguson, Missouri, at Martha's Vineyard, Massachusetts, on August 14, 2014. Obama called Thursday for 'peace and calm' in the Missouri town where the police shooting of an unarmed black youth has sparked angry protests. Obama lamented the 'heartbreaking' death of Michael Brown, an 18-year-old killed Saturday in Ferguson but urged both police and protesters to refrain from violence. 'Now is the time for peace and calm on the streets of Ferguson,' he told reporters. AFP PHOTO/Nicholas KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Image

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John King, Nia-Malika Henderson and Maggie Haberman discuss the president weighing in on Ferguson.

Obama: No excuse for 'excessive force'

John King, Nia-Malika Henderson and Maggie Haberman discuss the president weighing in on Ferguson.