Associated Press
FILE - In this Sept. 21, 2015 file photo President and CEO of Volkswagen Group of America, Inc. Michael Horn at the Brooklyn Navy Yard in New York. Volkswagen's top U.S.-based executive is expected to testify before Congress Thursday that he first learned in 2014 of emissions problems with the German automaker's diesel cars. But in prepared remarks, Volkswagen Group of America CEO Michael Horn doesn't directly address when he was first told his company had developed on-board computer software designed to deceive emissions tests.  (AP Photo/Kevin Hagen, File)

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