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Washington — The At&T-Time Warner antitrust trial began to wind down on Monday as the Justice Department presented two expert witnesses who have raised doubts about the cost savings and new revenue that can be tied to the merger.

At&T’s John Stankey, tasked with overseeing the integration of the companies, last week testified that his group had identified about $2.5 billion in merger synergies, including cost savings and additional revenue. Those synergies may play a role in how U.S. District Judge Richard Leon ultimately views the transaction, as they make the case that the merger will produce certain efficiencies.

One of the Doj’s witnesses, Ronald Quintero, said that none of the companies claimed synergies that he studied could be verified through documentation or were not specific to the merger. He said that some of the figures that At&T-Time Warner used were speculative.

In a contentious cross-examination,...

Washington — A senior executive at Charter Communications testified at the At&T-Time Warner antitrust trial that he has concerns that the merger will enable the combined company to demand “excessive” price increases and give them greater leverage over content-bundling practices.

But Tom Montemagno, who, as Charter’s executive vice president of programming acquisition, is chief negotiator for carriage of cable channels, said that he was largely unaware of the contents of a study that Charter commissioned in 2016 to gauge the impact of the potential loss of Turner network channels, which include CNN, TBS, and TNT.

That study, which initially cost $700,000 and was done by Altman, Vilandrie & Co., came up with a key estimate that Charter would suffer a 9% loss in current and potential subscribers if it were to lose the Turner channels. It was commissioned by Charter in advance of what were expected to be tough negotiations for carriage...