President Trump took aim at Fox News as South Bend Mayor Pete Buttigieg appeared on the network Sunday and received a standing ovation from the audience.

“Hard to believe that Fox News is wasting airtime on Mayor Pete, as Chris Wallace likes to call him,” Trump tweeted on Sunday.

“Fox is moving more and more to the losing (wrong) side in covering the Dems. They got dumped from the Democrats boring debates, and they just want in,” the president wrote.

“They forgot the people who got them there,” he continued in another tweet.

“Chris Wallace said, ‘I actually think, whether you like his opinions or not, that Mayor Pete has a lot of substance…fascinating biography.’ Gee, he never speaks well of me – I like Mike Wallace better…and Alfred E. Newman will never be President!” he concluded.

Trump’s nickname for Buttigieg comes from the MAD magazine star.

Fox News gave Buttigieg a platform to attack Fox News hosts: