The U.S. Federal Trade Commission is preparing to launch an investigation into anti-competitive practices at Microsoft's cloud computing business, sources familiar with the matter told Reuters on Thursday.

The probe would be the latest regulatory scrutiny against Big Tech from FTC Chair Lina Khan. Microsoft already faced a challenge from the FTC under Khan’s leadership targeting its acquisition of video game publisher Activision Blizzard, a $69 billion deal that was one of the largest in tech history.