A crowded agenda on the Sunday shows begins with Liz Cheney, now vice chairman of the January 6 committee and the proud target of a Trump-backed primary challenge in her home state of Wyoming. She’ll chat with “Face the Nation” about the progress her committee has made in investigating the insurrection, including a request to telecom companies to preserve the phone records of, among other people, Kevin McCarthy. She’ll also comment on Harriet Hageman, an ally and donor who’s now gone MAGA in hopes of replacing her in Congress.

Surgeon General Vivek Murthy is also a guest this morning, tapped to appear on “This Week” and “State of the Union” to defend Biden’s sweeping new vaccine mandate for companies with more than 100 employees. A discussion of the legal merits of that mandate would be more interesting but the White House isn’t eager to engage in that for obvious reasons. Having public-health experts like Murthy make the moral case for mandates is firmer ground for them politically. RNC chair Ronna McDaniel will argue against the mandate on “Face the Nation,” which probably suits the Biden administration just fine. The more they can make this a partisan political issue while attacking anti-mandate Republicans as anti-vax, the happier they are.

Finally, the Democratic civil war over infrastructure will play out on “This Week” and “State of the Union” with visits from Bernie Sanders and Joe Manchin. (Manchin will also be on “Meet the Press.”) Bernie wants to go ultra-mega-big on reconciliation spending, of course, while alleged fiscal hawk Manchin is prepared to draw the line at mega-big, with a cap of $1.5 trillion. Manchin’s take on Biden’s vaccine mandate will also be interesting given that he represents a blood-red state. The full line-up is at the AP.