Time Warner Cable’s CEO Robert Marcus, who began his career as an associate at Paul, Weiss, Rifkind, Wharton & Garrison, said Thursday that the wait for regulatory clearance could delay the proposed timetable for his company’s $55 billion merger with Charter Communications.

In May, The Am Law Daily looked at the half-dozen Am Law 100 firms working on various aspects of the transaction, which will also see Charter absorb Bright House Networks in another $10.4 billion deal. Initially expected to close before year’s end, top executives at Charter and TWC are now saying publicly that they expect their union to be finalized by the first quarter of 2016. And both sides have retained an array of high-powered lobbyists to help make that happen.