Fifth-term Rep. Jason Chaffetz (R) is retiring. Chaffetz has been high-profile (and somewhat controversial) in the House for his lead of the Oversight committee and was often talked about as a potential candidate for higher office, but instead he will call it quits.
The decision opens up UT-3, which went 47-23 for Trump. This being Utah, the usual places to go for Great Mentioner action (the legislature and local offices) don’t really apply, as the state tends to be more or less allergic to promoting pols (as an example, it hasn’t promoted a House member to the Senate since 1940). The most obvious candidate is former presidential candidate
Egg McMuffin Evan McMullin (R), who took the lions’ share of the third party vote in this seat and has stayed active as a pretentious self-promoter since. A member of the Romney clan could be a strong candidate. And there is a very good chance of someone coming out of nowhere; just one of Utah’s current delegation had any elected political experience before winning their seat.