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Mr Briggs told the BBC that he felt his years of campaigning was on the "edge of a breakthrough", but that he would remain "cautiously optimistic" until the amendment became law.

Brandy Moore White, president of the national union for federal prison workers, said she’s “cautiously optimistic” about Marshall’s appointment, though she wasn’t familiar with him.

In a March 28 update on environmental monitoring efforts, the group said it was “cautiously optimistic that chemical contamination from the fires no longer poses a major risk for beachgoers.”

Despite his comments, political leaders in Denmark cautiously welcomed the change of plan, and especially the limiting of the itinerary to just the US base.

“There are a lot of variables that are unique to his situation. So I think it’s just about having an open mind and trying to be cautiously optimistic and take the right approach.”