Andrew Strong is a high ranking CIA agent whom Michael made a deal with to get Maddie and the rest of his team set free.
Strong made the deal because he believes Michael is the only person he can entrust with a dangerous mission. The mission involves thwarting an American named Randall Burke who is believed to be running a freelance terror organization. He is someone Strong has been tracking eight years. Strong also arranges for Simon's release from prison, using him as a CIA asset for several years.