How did Harry Truman use his presidential powers to bring about a significant change during the Cold War? Responses He dissolved Congress and called for special elections to select new members. He dissolved Congress and called for special elections to select new members. He invoked executive privilege to block attempts to view his communications. He invoked executive privilege to block attempts to view his communications. He issued an executive order desegregating the U.S. military. He issued an executive order desegregating the U.S. military. He issued an executive order blocking emigration from Asian nations.