(Reuters) -Omnicom's ( OMC ) $13.5 billion acquisition of rival Interpublic can move forward on the condition that the new company does not enter agreements with others to steer ad dollars towards or away from publishers based on political content, the U.S. Federal Trade Commission said on Monday.

The deal would still allow individual advertisers to specify where their ads are shown, according to the agency.

Spokespeople for the companies did not immediately respond to requests for comment.

Omnicom ( OMC ) struck a $13.25 billion all-stock deal in December to buy rival Interpublic Group, creating the world's largest advertising agency.