"Less than a week after Stefan Halper was outed as the FBI informant who infiltrated the Trump campaign, public records reveal that the 73-year-old Oxford University professor and former U.S. government official was paid handsomely by the Obama administration starting in 2012 for various research projects."

https://www.zerohedge.com/news/2018-05-21/fbi-informant-stefan-halper-paid-over-1-million-obama-admin-spied-trump-aide-after