From the National Journal: Sen. Amy Klobuchar (D-Minn.) — a member of the Senate Judiciary Committee — wrote a letter to the CEOs of AT&T and T-Mobile asking them to explain how their proposed merger will help consumers.

"I remain concerned that the merger will lead to fewer choices, higher prices, and reduced services for wireless consumers," she wrote in the letter.

The CEOs of both companies will testify next week to a subcommittee of the Senate Judiciary Committee, which will check on antitrust implications of the merger through its oversight of the Department of Justice.

Klobuchar also sits on the Senate Commerce Committee, which oversees the Federal Communications Commission, which, along with DoJ, must approve the merger.
"How will you ensure that the proposed transaction will not lead to higher prices for consumers?" Klobuchar asks in her letter.