Also Read: Fox News' Chris Wallace: RNC Is Now a 'Trump Convention,' Not a Republican Convention (Video)All three saw dips in total and demo viewers from the previous election cycle in 2016. During the first night of the RNC in 2016, Fox News had 1.6 million viewers in the key demo.That same year, CNN averaged 3.945 million total viewers in the key primetime hour, with 1.374 million of those in the key demo.