Paul Singer, founder, CEO, and co-chief investment officer for Elliott Management Corporation, attends the Skybridge Alternatives (SALT) Conference in Las Vegas, Nevada in this May 9, 2012, file photo. Billionaire New York investor Paul Singer sent a letter to dozens of other donors on October 30, 2015, declaring his support for Rubio in a major blow to the struggling campaign of former Florida Governor Jeb Bush, the newspaper said.  REUTERS/Steve Marcus/Files
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