AT&T and T-Mobile spend $14 million on lobbying

The increase in lobbying efforts comes as the Justice Department and the Federal Communications Commission review AT&T's $39 billion acquisition of T-Mobile.

Lawmakers have lined up on both sides of the merger debate; House Judiciary Chairman Lamar Smith (R-Texas) announced his support of the deal on Tuesday. 

Sen. Herb Kohl (D-Wis.), chairman of the Senate Judiciary Committee's Antitrust subpanel, said last month he thought regulators should block the merger.