File - In this Thursday, March 25, 2021 file photo, German Chancellor Angela Merkel attends a session of the German parliament Bundestag ahead of an European Union summit at the Reichstag building in Berlin, Germany. German Chancellor Angela Merkel has talked about her country’s difficulties, during the coronavirus pandemic. In a lengthy television interview late Sunday she called for greater flexibility to tackle the latest surge in cases. (AP Photo/Markus Schreiber, file)

File - In this Wednesday, March 24, 2021 file photo German Chancellor Angela Merkel answers questions from lawmakers at German parliament Bundestag in Berlin, Germany. German Chancellor Angela Merkel has talked about her country’s difficulties, during the coronavirus pandemic. In a lengthy television interview late Sunday she called for greater flexibility to tackle the latest surge in cases. (AP Photo/Markus Schreiber)

Armin Laschet, Christian Democratic Union party chairman and Minister President of North Rhine-Westphalia, speaks at a press conference in the party's headquarters in Berlin, Germany, Monday, March 29, 2021. (Michael Kappeler/dpa via AP)

People wear face masks as they queue in front of the vaccination center in Frankfurt, Germany, Monday, March 29, 2021. (AP Photo/Michael Probst)

A face mask was left back on the square in front of the Old Opera in Frankfurt, Germany, Monday, March 29, 2021. (AP Photo/Michael Probst)

FILE - In this Wednesday, March 24, 2021 file photo, German Chancellor Angela Merkel attends the weekly cabinet meeting of the German government at the chancellery in Berlin. German Chancellor Angela Merkel has talked about her country’s difficulties, during the coronavirus pandemic. In a lengthy television interview late Sunday she called for greater flexibility to tackle the latest surge in cases. (Kay Nietfeld/Pool via AP, File)

File - In this Wednesday, March 24, 2021 file photo German Chancellor Angela Merkel answers questions from lawmakers at German parliament Bundestag in Berlin, Germany. German Chancellor Angela Merkel has talked about her country’s difficulties, during the coronavirus pandemic. In a lengthy television interview late Sunday she called for greater flexibility to tackle the latest surge in cases. (AP Photo/Markus Schreiber)

An elderly woman wearing a face mask walks past a plastic cow that decorates a hotel entrance in Frankfurt, Germany, Monday, March 29, 2021. (AP Photo/Michael Probst)