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Published April 18, 2012, 12:00 AM

Sen. Susan Collins

In this March 30, 2011 file photo, Senate Homeland Security and Governmental Affairs Committee ranking Republican Sen. Susan Collins, R-Maine speaks on Capitol Hill in Washington. At least 20 women were involved in last weekend's hotel incident with Secret Service agents, U.S. Marines and prostitutes in Colombia just before President Barack Obama's visit, a senator says. Congressional and military investigators begin to dig into the situation more deeply. (AP Photo/J. Scott Applewhite, File)
Read the article: Secret Service prostitution scandal roils DC