US Senator Herb Kohl on Tuesday sent a letter to FTC Chairman Jon Leibowitz urging an investigation into Google's buyout of AdMob. The official's notice warned that Google's dominance of both ads and search on the desktop, along with AdMob's control of the mobile space, could create "undue market dominance" for ads either in search or within apps. Kohl stopped short of calling for a halt to the deal but wanted a review.
