Sen. Joni Ernst (R-IA) is not only a critical swing vote as the nomination of Pete Hegseth teeters on the edge over claims of misconduct.

She could also be Hegseth’s replacement should he withdraw as President-elect Donald Trump’s pick for defense secretary. As a combat veteran with 23 years of military service, Ernst is emerging as one of several alternatives who could sail through Senate confirmation without the cloud of controversy that has hung over Hegseth’s nomination.