Billionaire Carl Icahn can go ahead and buy large blocks of Yahoo, pushing forward his plan of waging a proxy war against the search engine. This came after the Federal Trade Commission gave Icahn the nod, Reuters reports.

Early this month, Icahn made public is plan of waging a campaign to replace Yahoo’s board, installing a new board, and making the board negotiate once again with Microsoft.

For Icahn, the Microsoft offer is already acceptable.