PARIS — The United States is dragging its feet on approving President Emmanuel Macron’s pick for French ambassador to Washington amid a spat over human rights at the United Nations, according to three people familiar with the dispute.

Macron may have charmed U.S. President Donald Trump with pleasantries and fine dining at Versailles Palace during his June visit to France, but the delay in approving the new envoy reveals that diplomatic tensions between the two countries are still simmering.

Aurélien Lechevallier, a longtime Macron ally, was expected to take office next month but his posting is yet to be approved by the U.S. Department of State — a process that is usually a formality between allied countries.