Reid Scott, Tim Simons and Matt Walsh have joined the cast of HBO's comedy pilot Veep starring Julia Louis-Dreyfus. The Washington, D.C.-set project, from British comedian, writer and director Armando Iannucci, centers on former Senator Selina Meyer (Louis-Dreyfus) who becomes Vice President. Former My Boys co-star Scott will play Dan Egan, a DC legend. Simons will play Jonah who works in the President's office, and Walsh will play Mike, Meyer's spokesman. The trio join previously cast Anna Chlumsky.