Instructions: 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.
Input: Given Relationship: 'be president of', Sentence: 'Richard Milhous Nixon , the thirty-seventh President of the United States became President in 1969 after defeating Lyndon Johnson 's Vice-President , Hubert Humphrey , in one of the closest elections in US history .'
Output:
President