Trump could pick Haley if he were convinced she could help him win the presidency, avoid a potential prison sentence and cover tens of millions in legal bills if he loses, the report said, Reuters reported.
Haley, the former South Carolina governor and a former US ambassador to the United Nations, ended her log-shot challenge to Republican presidential frontrunner Trump in March.
She said it was likely Trump - who repeatedly belittled her candidacy - would be the Republican nominee but did not endorse him.