KRVS

Soraya Sarhaddi Nelson

Updated at 4 p.m. ET

Richard Grenell has been the U.S. ambassador to Germany for barely a month, but already politicians on both sides of the Atlantic are demanding he be recalled.

On Thursday, Hamburg became the first city in Germany to ban diesel vehicles on its streets — at least in part. But many Germans question whether the limited ban is an environmental milestone, as the city claims, or a political shell game that will ultimately create more pollution.

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Germany waited nearly 16 months for the Trump administration to send a new ambassador to Berlin. But Richard Grenell managed to offend many Germans the day he arrived by posting this note on Twitter:

"As @realdonaldtrump said, US sanctions will target critical sectors of Iran's economy. German companies doing business in Iran should wind down operations immediately."

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