Washington (CNN) For anyone who watches Fox News Channel, it's not at all surprising that its anchors and hosts (with few notable exceptions) talk up President Donald Trump while knocking down the Democrats running against him in 2020.

While that position puts Fox somewhere in the gray area between journalism and activism, it's not exactly new. There are ratings in partisanship -- so Fox News engages in partisanship.

But even partisanship should have its limits. And one of those limits should be raising entirely unfounded questions about a presidential candidate's health. Which is exactly what two Fox News personalities -- Kennedy and Sean Hannity -- have done, according to this terrific piece by the Daily Beast Justin Baragona:

"Since the end of May, Fox Business Network and Fox News star Lisa 'Kennedy' Montgomery and Fox News prime-time host Sean Hannity have speculated on-air, on at least four separate occasions, that the current Democratic presidential frontrunner is secretly dealing with health issues, often comparing his condition to illness-related conspiracy theories the network pushed about Hillary Clinton during the 2016 election."

Kennedy claimed that conversations among Democratic opposition-researchers all center on "you know there is something wrong with the former vice president." She offered no proof for this claim.