They shake hands at Cabinet meetings and call each other friends, but according to GOP insiders, the relationship between Vice President J.D. Vance and Secretary of State Marco Rubio is a carefully managed façade. According to Rob Shuter's Substack page, a source said, "These two are absolutely rivals. They play nice in public, but privately they cannot stand each other." How the feud began The rivalry reportedly crystallized at a donor gathering at Mar-a-Lago on February 28, when Donald Trump asked attendees whom they would prefer he support for president in 2028.