The Barack Obama presidential campaign hired Fusion GPS in 2012 to dig up dirt on Republican presidential candidate Mitt Romney, according to a book released on Tuesday.

The Obama campaign hid its payments to Fusion GPS through its law firm, Perkins Coie. The arrangement is similar to the one that the Clinton campaign and Democratic National Committee used to pay Fusion for its investigation of then-candidate Donald Trump in 2016.

“In 2012, Fusion GPS was hired to do opposition research on Mitt Romney for Barack Obama’s reelection campaign,” reads “Russian Roulette: The Inside Story of Putin’s War on America and Donald Trump’s Election.”

The book is written by Michael Isikoff and David Corn, two veteran reporters who met during the 2016 campaign with Steele and Fusion GPS founder Glenn Simpson.

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