Google, Facebook, and Amazon and several other major tech companies will testify at a U.S. hearing on the French government's digital services tax on Monday morning.

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The precedent-setting tax was described by the U.S. Trade Representative's Office as "unreasonable." The office opened a public comment period up to new French tariffs and other trade restrictions, which closes on Aug. 26, just before the G-7 summit in Biarritz, France.

The French Senate approved a 3 percent levy in July that would apply to digital services revenue earned in France by companies with more than 25 million euros in French revenue and 750 million euros ($838 million) worldwide.