Yesterday, ProPublica and PBS Frontline – in conjunction with the Investigative Reporting Program of the University of California – published a piece on leading Republican donor Sheldon Adelson and how he is under expanding scrutiny by federal and Nevada investigators for actions that may violate the Foreign Corrupt Practices Act. ProPublica managing editor Stephen Engelberg was on the Rachel Maddow Show last night to discuss the report on Adelson. The interview, which begins at 11:32, covers how Adelson has become the single largest Republican donor in this election (if not the single largest American donor of all time), the dire financial situation Adelson's company faced after the economic downturn, and how the Justice Department might go about investigating possible violations of the Foreign Corrupt Practices Act.

Visit NBCNews.com for breaking news, world news, and news about the economy

PBS NewsHour also had Engelberg on to explain the investigation and how internal emails disclosed in his report for the first time show that Adelson's company came to pay $700,000 in legal fees to a Macau legislator.

Watch Did GOP Money Man Sheldon Adelson Violate Bribery Law? on PBS. See more from PBS NewsHour.