3349
In this post ( in which he was retained by President William McKinley until 1898 ) he was from the first called upon to deal with a situation of great difficulty , which culminated with the destruction of the warship .
 William McKinley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 William McKinley