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Mark Krikorian , director of the nonpartisan , Washington - based Center for Immigration Studies , believes Fox ' s call for an open border is a ` ` bargaining chip . ' '
 Washington, the nonpartisan , Washington - based Center for Immigration Studies, Mark Krikorian, director of the nonpartisan , Washington - based Center for Immigration Studies, Fox, an open border
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 Washington, the nonpartisan , Washington - based Center for Immigration Studies, Mark Krikorian, director of the nonpartisan , Washington - based Center for Immigration Studies, Fox, an open border