North Rhine-Westphalia's State Premier and head of Germany's conservative Christian Democratic Union (CDU) party, Armin Laschet, left, and Bavaria's State Premier and leader of the Bavarian Christian Social Union (CSU) Markus Soeder arrive for a CDU/CSU leadership in Berlin, Sunday June 20, 2021, on the eve of the unveiling of their electoral program ahead of the September general election. (Odd Andersen/Pool via AP)

German Chancellor Angela Merkel arrives for a leadership meeting of the Christian Democratic Union (CDU) and the Bavarian Christian Social Union (CSU) in Berlin, Sunday June 20, 2021, on the eve of the unveiling of their electoral program ahead of the September general election. (Odd Andersen/Pool via AP)

Christian Democratic Union (CDU) chairman Armin Laschet, left, and Christian Social Union (CSU) chairman Markus Soeder, right, bump elbows during a press conference in Berlin, Germany, Monday, June 21, 2021. (Michele Tantussi/Pool Photo via AP)

North Rhine-Westphalia's State Premier and head of Germany's conservative Christian Democratic Union (CDU) party, Armin Laschet speaks to the media ahead of a leadership meeting of the Christian Democratic Union (CDU) and the Bavarian Christian Social Union (CSU) in Berlin, Sunday June 20, 2021, on the eve of the unveiling of their electoral program ahead of the September general election. (Odd Andersen/Pool via AP)

Armin Laschet, left, chairman of the German Christian Democrats (CDU) and Markus Soeder, right, chairman of the German Social Union (CSU) greet each other at the closed meeting of CDU and CSU party leaders in Berlin, Germany, Monday, June 21, 2021 to adopt the election platform for the German federal elections. (Kay Nietfeld/dpa via AP)