Former President Barack Obama in his new book discussed his ambivalence over the killings he ordered while president as part of counterterrorism operations.
The first drone strike of Barack Obama's presidency occurred just three days after he was sworn into office.
The former president said Emanuel had "spent enough time in Washington to know that his new, liberal president couldn't afford to look soft on terrorism."
Awlaki's 16-year-old son, Abdulrhaman al-Awlaki, was killed in another drone strike ordered by the Obama administration just two weeks later.
In 2010, a man named Faisal Shahzad attempted to bomb Times Square in New York City, later citing drone strikes as his inspiration for the failed bombing.
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