Günther was a CDU delegate to the Federal Convention for the purpose of electing the President of Germany in 2017 and 2022.17th Federal Convention, 13 February 2022, List of Members Bundestag. In the – failed – negotiations to form a coalition government with the Christian Social Union in Bavaria (CSU), the Free Democratic Party (FDP) and the Green Party following the 2017 national elections, he was part of the 19-member delegation of the CDU. In the ensuing negotiations with the Social Democrats, he led the working group on transport and infrastructure, this time alongside Thomas Strobl and Sören Bartol.
