Re: Altaf hussain arrested | Bail Rejected
Referring to your own post as “reference”, lol. This below is what is called “reference” 
USA.gov: The U.S. Government’s Official Web Portal
http://travel.state.gov/content/travel/english/legal-considerations/us-citizenship-laws-policies/citizenship-and-dual-nationality/dual-nationality.html
Is Dual Citizenship Allowed in the United States? | Legal Language Services
Renouncing citizenship is NOT required.