U.S. President Joe Biden’s political fortunes have changed dramatically since his first Group of Seven summit last summer, or even his last visit to Europe in March. It couldn’t come at a worse time for his international allies as Russia settles into a long war with Ukraine.

German Chancellor Olaf Scholz, who will welcome G7 leaders in the Bavarian Alps, views Biden as a driving force in sustaining pressure on Moscow and believes that unity among allies could fray once again if Republicans win back the White House in 2024, according to a German government official who requested anonymity to discuss internal thinking.

It was only a year ago, on a sandy English beach in Cornwall, when European leaders celebrated that Donald Trump was gone and that the U.S. had returned to the multilateral orbit. Now, that relief has been replaced with a sense of foreboding about whether Biden’s Democrats survive midterm elections and the president’s political longevity.