Robert Alexander McCallister is a fictional character on the ABC television series Brothers & Sisters. He is portrayed by Rob Lowe. Married to Kitty Walker (Calista Flockhart), he was a Republican senator from the state of California, a former candidate for President of the United States, and a former candidate for Governor of California.

Robert McCallister first met Katherine 'Kitty' Walker (Calista Flockhart) when she interviewed him on her talk show. A recent divorcee his wife Courtney (Marin Hinkle) with two young children, he was involved in a scandal regarding allegations of infidelity. Kitty was more interested in asking for his help to get her brother Justin (Dave Annable) out of being sent to Iraq, but Robert could do nothing. With Kitty's talk show folded, Robert asked her to become the communications director for his Presidential campaign. They soon began a romantic relationship, over the vehement objections of her gay brother Kevin (Matthew Rhys), who objected to Robert's record on gay marriage. Thanks to Kitty, Kevin had a brief relationship with Robert's gay brother Jason (Eric Winter), which ended badly, not doing much to endear Robert or Kevin to each other, but they came to an understanding.

Robert and Kitty got engaged and had their party at Kitty's family home. Robert's own family, however, stole the spotlight. Robert came under the spotlight when the Republican primary for President kicked into a higher gear. During the Gulf War, Robert was hailed as a hero for something he did not actually do. This secret was revealed during the primary, causing his opponent to question his patriotism. Robert was forced to hire a very skilled consultant named Isaac (Danny Glover), whom he disliked due to Isaac outing Jason while working for one of Robert's primary opponents during a state senate campaign. When Jason found out Isaac had been the one responsible, and was now working for Robert, he was furious, but soon forgave his brother.

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