 He was elected deputy leader of the Liberal Party at the 2010 party convention.In February 2012, Solum Larsen resigned from all his party positions after a 17-year-old girl accused him of raping her at the Rogaland Liberal Party's annual congress in Suldal; he said that only consensual sex had occurred, and was briefly admitted to the psychiatric clinic at Stavanger University Hospital.In October the Rogaland public prosecutor declined to pursue the case.