Musk has emerged as a fervent supporter of Alternative for Germany, a far-right, anti-immigrant party that is polling in second place ahead of Germany's parliamentary election.

With international politics in flux, three leading historians give their views on the most consequential election in a generation for Europe’s most powerful country.

The leading candidate, Friedrich Merz, a conservative who has adopted many of the AfD’s hard-line positions on immigration, used his closing statement of the debate to promise his voters that he would never allow the AfD into his government. Under him, he said, the firewall would hold.