Wolfgang Kubicki, deputy chairman of the German parliament, on Tuesday called on German Foreign Minister Heiko Maas to immediately declare US Ambassador in Berlin Richard Grenell persona non grata over his repeated interference in the country's internal affairs, Sputnik reported.

"The fact that the US ambassador again interferes in political issues of the sovereign Federal Republic can no longer be tolerated… I call on Foreign Minister Heiko Maas to immediately declare Richard Grenell persona non grata. Anyone who, as a US diplomat, acts like a high commissioner of an occupying power must learn that our tolerance also has limits," Kubicki wrote on Facebook.

On Monday, Grenell criticized Germany for moving away from NATO's target to spend 2 percent of GDP on defense when planning the budget.
Media reported in January that Grenell had sent letters to a number of German companies hinting that Washington could introduce sanctions for supporting the Nord Stream 2 gas pipeline project. The Handelsblatt newspaper then reported that the German Foreign Ministry had described Grenell's letters as a "provocation."