The first episode of “Fox News Tonight,” the replacement program for “Tucker Carlson Tonight,” dropped in ratings within the key 25- to 54-year-old age demographic after premiering Monday evening, Show Buzz Daily data shows.

Fox News abruptly parted ways with Daily Caller co-founder Tucker Carlson, the network’s top primetime host, Monday morning. “Tucker Carlson Tonight” aired weeknights at 8 p.m. The replacement show, hosted by anchor Brian Kilmeade, garnered fewer ratings in the key age demo on its first night compared to Carlson’s average a week prior on Monday, April 17, according to ratings website Show Buzz Daily.

The program had rating of 0.24 in the 25-54 age demographic, while Carlson’s show saw a 0.37 rating in the same demographic April 17, the data shows. The show averaged nearly 2.6 million viewers in total, below Carlson’s show Monday, which averaged roughly 3.7 million viewers.

[This will be a problem until Fox settles on a replacement. That’s a big drop, too. Still, 2.6M viewers is pretty good in that time slot. — Ed]