Advocacy groups wanted a full investigation of privacy concerns raised by the companies' $19 billion merger.
The Democratic majority sitting on the Federal Communications Commission on Monday brushed aside a furious campaign by broadcasters and voted to restrict local television partnerships that critics say have been used to circumvent federal limits on local TV station ownership.
Whether food distribution is a national market will be key to the agency's view of the merger.
TV partnerships would be dropped in duopoly markets to appease regulators.
Without mentioning the target by name, he urges Washington to drop its opposition to a merger with Sprint.
Agency insists divestments of Reagan National and LaGuardia slot to low-cost carriers will benefit travelers.
Local TV limits and other media rules are teed up for March 31 commission vote.
Martin Marietta has acknowledged overlaps in Oklahoma and Texas, but merger could receive antitrust approval as early as March 20.
An antitrust watchdog group warned Tuesday that the $8.2 billion proposed acquisition of US Foods by Sysco will create a monopoly among broadline food distributors, which specialize in delivering food and food service supplies to institutional clients such as restaurants, universities and military bases.
Opponents of media consolidation have been seeking restrictions on the arrangements for years.