Fox News was knocked off the number one slot as the most-watched primetime cable television network in America, after being overtaken by MSNBC.
During this time the more centrist network gained 2.34 million viewers, while Fox News had 2.25 million.
The sought-after evening slots include shows from Fox presenters Sean Hannity and Tucker Carlson, and the network previously gained the highest number of viewers.
Fox News was still the most-watched daytime network between 17 to 21 July in terms of daytime viewing, with an average of 1.3 million viewers, while MSNBC came third at 1.1 million.
It was also the most-watched network for both daytime and primetime during the full week of 17 to 23 July, Nielsen found.
Figures for the entire week - taking in the weekend - showed Fox had the biggest audience share during primetime slots, with 1.93 million compared to MSNBC's 1.84 million.
Mr Trump's favourite network remains Fox News, and he has frequently highlighted their reporting on social media. »