Every presidential primary season is defined by a few questions that candidates spar over for the length of the contest. In the 2008 Republican primary, it was over the bipartisan immigration bill the conservative wing labeled “amnesty,” a debate John McCain, a co-author of the bill, survived to win the nomination. For Democrats in 2016, it was over single-payer healthcare: Bernie Sanders’s promise of “Medicare for all,” which Hillary Clinton insisted would “never, ever come to pass.” Clinton won the nomination, but Sanders won the argument.
The nascent 2028 Republican primary already has its marquee question, one every candidate will face again and again and whose answers will be dissected ad nauseam: Was President Donald Trump right to launch the war against Iran in February 2026? The two leading contenders to succeed Trump as the party’s standard-bearer, Vice President JD Vance and Secretary of State Marco Rubio, are already offering starkly different answers, in both substance and tone.
