It may not apply to presidential elections in most states

The link discusses the case and cites several examples of minor party presidential candidates who were defeated in presidential primaries for another party but ran for another party in the general election. Lyndon LaRouche and John Anderson are two examples that were cited.

The link is from Ballotpedia from an article in Ballot Access News, which seems relatively neutral. Whether sore loser laws could take effect or not, Trump would be able to sabotage the chances of a GOP candidate.

Click here for link at https://ballotpedia.org/Sore_loser_laws_for_presidential_can