 In the negotiations to form a coalition government following the 2009 federal elections, Pfeiffer was part of the CDU/CSU delegation in the working group on economic affairs and energy policy, led by Karl-Theodor zu Guttenberg and Rainer Brüderle.He has since served as the CDU/CSU parliamentary group’s spokesperson for economic affairs.Following the 2013 federal elections, he was part of the CDU/CSU team in the negotiations with the SPD on a coalition agreement.