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.

On Sunday, the country’s residents will vote in a pivotal election in which Ms Weidel's party, Alternative for Germany (AfD), is tipped to come in second. A snap election was called at the end of last year by current Chancellor Olaf Scholz, of the Social Democratic Party (SPD), when his coalition Government fell apart.

The Tesla and SpaceX owner backs leader of the most extreme party in the fray for election crucial for the future of Europe; US Vice-President JD Vance also met her secretly in Munich

Musk won AfD a massive new audience, and JD Vance added support. That brought the party outsized attention, but the impact in Germany was limited, data shows.

The leader of the Alternative for Germany (AfD) party has been endorsed by Donald Trump - and looks set to make huge gains in this weekend's snap election.