DES MOINES, Iowa (AP) — More than 18 months before the first presidential primary of 2024, most potential Republican candidates are just getting a sense of the political landscape, tiptoeing through early-voting states and trying to make friends in key places. Then there's Kristi Noem.

The South Dakota governor has come out swinging as she tries to carve a niche among an early crowd of possible GOP rivals for the White House. Her combative style, no surprise to those who follow her, is evidence of how competitive the nomination race will be if Donald Trump stays on the sidelines.

Noem charged...