What impact did the letter by Republican senators to Iranian leaders have on U.S.-Iranian negotiations concerning Iran's nuclear program?

Question

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The letter by Republican senators to Iranian leaders in 2015, warning that any agreement without congressional approval could be reversed by the next president, ultimately had little impact on the negotiations themselves. The negotiations continued, leading to the Joint Comprehensive Plan of Action (JCPOA) being agreed upon later that year.

What Impact Did the Letter by Republican Senators to Iranian