Tesla Inc.’s sales plummeted 59% last month in Germany, adding to indications that Chief Executive Officer’s Elon Musk political activities are hurting the carmaker’s business in major electric vehicle markets.

Tesla sales plunged in Germany last month, official data showed Wednesday, after billionaire owner Elon Musk waded into the country's election campaign by vocally backing the far right.

Tesla has suffered a sales slump in France amid a growing backlash against Elon Musk from the country’s drivers. The electric carmaker registered only 1,141 cars sold in France last month, down by almost two thirds from 3,118 last year.

The U.S. electric car company’s sales are sliding across Europe, amid what many see as interference in local affairs by Tesla’s chief executive, Elon Musk.