Fusion GPS, the research firm hired by Hillary Clinton’s campaign and the Democratic National Committee to produce the salacious dossier on Donald Trump, was also hired by President Barack Obama to “dig up dirt” on his Republican opponent Mitt Romney during the 2012 presidential campaign, according to a new book released on Tuesday.

The book states that Obama funneled the money to Fusion GPS through the law firm, Perkins Coie – the same law firm that the Clinton campaign and the DNC used when, together, they shelled out over $12 million during the 2016 election season to compile claims about Trump.

The Daily Caller reported:

“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.

“As had become standard practice in the shadowy world of ‘oppo’ research, the Obama campaign’s payments to Fusion GPS were never publicly disclosed; the money paid to the investigative firm was reported on campaign disclosure reports as legal bills to the campaign’s law firm, Perkins Coie,” the book reads.

The Obama for America committee paid Perkins Coie around $3 million during the 2012 election cycle, according to filings with the Federal Election Commission, A vast majority of the payments were earmarked for “Legal Services.”

It is not clear how the law firm paid Fusion GPS for its research on Romney, a former Massachusetts governor.