New Delhi, Feb. 24 -- The U.S. ambassador to France, Charles Kushner, has been banned from meeting members of the French government after not showing up at the Foreign Affairs ministry earlier in the day, where he had been summoned over comments on the killing of a French far-right activist last week, diplomatic sources said on Monday.

"Following the publication by the U.S. Embassy of comments on a tragedy that occurred in France and concerns only our national public debate - which we refuse to allow to be exploited - ambassador Charles Kushner was summoned today to the ministry. He did not show up," the source added.

French far-right activist Quentin Deranque was beaten to death in a fight with alleged hard-left activists, in an incide...