 Let's just talk for a second or two about who Donald Trump's Republican running mate might be, though. There are three men who are seen as frontrunners. Doug Burgum is the wealthiest governor in the US. Marco Rubio could help Mr Trump with the Hispanic vote. J.D. Vance is a friend of his son, Donald Jr. Of course, he might pick someone else entirely. Here's Neda Taufik in Washington, who's been taking a closer look at those contentors.