Fox News hosts Tucker Carlson and Shepard Smith have broken into full-blown civil war.

Carlson, joined on air by frequent guest and pro-Trump lawyer Joe diGenova , dedicated a segment of his prime time show Wednesday night to mocking his colleague for being partisan and for passing off opinion as news.

It was the latest in a volley of swipes between Carlson and Smith that kicked off Tuesday, when Fox News legal analyst and former judge Andrew Napolitano appeared on Smiths program and blasted President Donald Trump s Ukraine phone call as criminal.

Several hours later, over on Carlsons program, diGenova savaged Napolitanos commentary, calling him a fool and insisting that no part of Trumps call constituted a crime.

The following day, Smith returned fire: Last night on this network during prime time opinion programming, a partisan guest who supports President Trump was asked about Judge Napolitanos legal assessment and when he was asked, he said unchallenged Judge Napolitano is a fool.

Attacking our colleague, who is here to offer legal assessments, on our air in our work home is repugnant, Smith concluded.

In the latest installment of Fox News friendly fire, Carlson, a frequent apologist for Trump whose show suffered advertiser defections after he called white supremacy a hoax, replayed Smiths comments, then exaggeratedly mimicked the word repugnant and spewed a stream of thinly veiled insults.

Now, unlike maybe some dayside hosts, Im not very partisan, Carlson claimed, before going on to subtly attack Smith for passing off opinion as news.

It doesnt seem honest to me when a host, any host on any channel, including this one, pretends that the answer is obvious, Carlson said. Thats not news, is it? Thats opinion.

Smith has previously criticized his own network s journalistic integrity, saying that Fox employees on the opinion side could say whatever they want as theyre expressing opinion, not fact.

Watch the newest blow between the two below: