"We succeeded in what we set out to do in Afghanistan over a decade ago, then we stayed for another decade. It was time to end this war. This is a new world. The terror threat has metastasized across the world, well beyond Afghanistan. We face threats from al-Shabab in Somalia, al-Qaeda affiliates in Syria and the Arabian Peninsula, and ISIS attempting to create a caliphate in Syria and Iraq and establishing affiliates across Africa and Asia. The fundamental obligation of a president, in my opinion, is to defend and protect America. Not against threats of 2001, but against the threats of 2021 and tomorrow. That is the guiding principle behind my decisions about Afghanistan. I simply do not believe that the safety and security of America is enhanced by continuing to deploy thousands of American troops and spending billions of dollars a year in Afghanistan. But I also know that the threat from terrorism continues in its pernicious and evil nature. But it’s changed, expanded to other countries. Our strategy has to change too."