 Complete the following phrase:  Reul was a CDU delegate to the Federal Convention for the purpose of electing the President of Germany in 1994, 1999, 2004, 2009, 2010 and 2017. Since 2012, he has been serving on the Presidium of the CDU, under the leadership of successive chairwomen Angela Merkel 2012-2018 and Annegret Kramp-Karrenbauer since 2018. In the negotiations to form a Grand Coalition of Merkels Christian Democrats CDU together with the Bavarian CSU and the Social Democrats SPD following the 