In the 2013 federal election, Hoffmann received 30.7% of all direct votes cast within his electoral district No. 142 (Dortmund I), which makes him the most successful candidate of the Christian Democratic Union in this electoral district ever. From 2015, he served as a member of the German Bundestag. He succeeded Ronald Pofalla who decided to retire from parliament. He was a member of the Committee of Internal Affairs and a deputy member of the Committee of Petitions.