From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'be president of', Sentence: 'Ted Haggard resigned Thursday afternoon as president of the National Association of Evangelicals , amid allegations that surfaced Wednesday about involvement with a male prostitute .'
president

Given Relationship: 'present at', Sentence: 'Paper presented at the 10th International Conference on Turkish Linguistics , 16-18 August , Bozi University , Istanbul , Turkey .'
presented

Given Relationship: 'be leader of', Sentence: 'They also said that Palestinian leader Yasser Arafat held a telephone conversation with Israeli Foreign Minister Shlomo Ben-Ami , during which the two exchanged views on the latest development .'

leader