The Federal Trade Commission said today it is suing to block Microsoft’s planned $69 billion takeover of video game company Activision Blizzard, saying it could suppress competitors to its Xbox game consoles and its growing games subscription business.

The FTC voted 3-1 to issue the complaint after a closed-door meeting, with the three Democratic commissioners voting in favor and the sole Republican voting against. A fifth seat on the panel is vacant after another Republican left earlier this year.