Paramount had said it expected to close the $8.4 billion merger in the first half of 2025. But the first half of the year came and went, and the merger remained under review by the FCC and its chair Brendan Carr, who had been appointed to the role earlier this year by President Trump.

The deal, which came under intense scrutiny by the Trump administration, was hailed by the F.C.C. chief, who welcomed “significant changes” at CBS, a unit of Paramount.