Aside for honoring all the Hispanic people in America, his Spanish fluency allows him to have deep conversations with leaders in the Americas: Mexico, Panama, Columbia, Argentina, Cuba, and more.
Spanish is also the 4th most spoken language in the world (below English, Mandarin Chinese, and Hindi), but ahead of Arabic, French, Bengali, Portuguese, and Russian.
It’s worth watching starting at the 5 minute mark, Rubio starts speaking in Spanish and then cracks a joke with JD Vance at the end. So funny! :)