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.

Tesla sales careened lower in Germany in January, as sales of the electric-vehicle company headed by Elon Musk tumble across Europe. The German trade group VDA reported that Tesla new-vehicle registrations fell 60% in January,

Tesla sold almost 60% fewer cars in Germany in January than in the year-earlier period, as the U.S. electric vehicle maker faces a test of popularity amid headline-grabbing political involvement by its billionaire CEO Elon Musk.

Elon Musk will work under President Donald Trump as a “special government employee,” designating Musk as an unpaid employee of the federal government with fewer restrictions than full-time employees, according to the White House, as Musk’s so-called Department Of Government Efficiency has involved itself in multiple federal agencies in recent days.

Elon Musk and his allies are harnessing tech units and other agencies that handle daily federal operations to amass sweeping control of the executive branch.