He implemented a controversial family separation policy for migrants apprehended at the U.S.–Mexico border. Trump's demand for the federal funding of a border wall resulted in the longest US government shutdown in history. He deployed federal law enforcement forces in response to the racial unrest in 2020. Trump's "America First" foreign policy was characterized by unilateral actions, disregarding traditional allies. The administration implemented a major arms sale to Saudi Arabia; denied citizens from several Muslim-majority countries entry into the U.S; recognized Jerusalem as the capital of Israel; and brokered the Abraham Accords, a series of normalization agreements between Israel and various Arab states. His administration withdrew U.S. troops from northern Syria, allowing Turkey to occupy the area. His administration also made a conditional deal with the Taliban to withdraw U.S. troops from Afghanistan in 2021. Trump met North Korea's leader Kim Jong-un three times. Trump withdrew the U.S. from the Iran nuclear agreement and later escalated tensions in the Persian Gulf by ordering the assassination of General Qasem Soleimani.