The letter emphasizes the role of Congress in scrutinizing any potential agreement between the Obama administration and Iranian leadership.

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It has come to our attention while observing your nuclear negotiations with our government that you may not fully understand our constitutional system. Thus, we are writing to bring to your attention two features of our Constitution — the power to make binding international agreements and the different character of federal offices — which you should seriously consider as negotiations progress.

First, under our Constitution, while the president negotiates international agreements, Congress plays the significant role of ratifying them. In the case of a treaty, the Senate must ratify it by a two-thirds vote. A so-called congressional-executive agreement requires a majority vote in both the House and the Senate (which, because of procedural rules, effectively means a three-fifths vote in the Senate). Anything not approved by Congress is a mere executive agreement.

Second, the offices of our Constitution have different characteristics. For example, the president may serve only two 4-year terms, whereas senators may serve an unlimited number of 6-year terms. As applied today, for instance, President Obama will leave office in January 2017, while most of us will remain in office well beyond then—perhaps decades.

What these two constitutional provisions mean is that we will consider any agreement regarding your nuclear-weapons program that is not approved by the Congress as nothing more than an executive agreement between President Obama and Ayatollah Khamenei. The next president could revoke such an executive agreement with the stroke of a pen and future Congresses could modify the terms of the agreement at any time.

We hope this letter enriches your knowledge of our constitutional system and promotes mutual understanding and clarity as nuclear negotiations progress.

Sen. Steve Daines joined 46 Republican senators on March 9 in sending an open letter to the leaders of the Islamic Republic of Iran regarding the ongoing nuclear negotiations between Iran and the United States.

The letter emphasizes the role of Congress in scrutinizing any potential agreement between the Obama administration and Iranian leadership.

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It has come to our attention while observing your nuclear negotiations with our government that you may not fully understand our constitutional system. Thus, we are writing to bring to your attention two features of our Constitution — the power to make binding international agreements and the different character of federal offices — which you should seriously consider as negotiations progress.

First, under our Constitution, while the president negotiates international agreements, Congress plays the significant role of ratifying them. In the case of a treaty, the Senate must ratify it by a two-thirds vote. A so-called congressional-executive agreement requires a majority vote in both the House and the Senate (which, because of procedural rules, effectively means a three-fifths vote in the Senate). Anything not approved by Congress is a mere executive agreement.

Second, the offices of our Constitution have different characteristics. For example, the president may serve only two 4-year terms, whereas senators may serve an unlimited number of 6-year terms. As applied today, for instance, President Obama will leave office in January 2017, while most of us will remain in office well beyond then—perhaps decades.

What these two constitutional provisions mean is that we will consider any agreement regarding your nuclear-weapons program that is not approved by the Congress as nothing more than an executive agreement between President Obama and Ayatollah Khamenei. The next president could revoke such an executive agreement with the stroke of a pen and future Congresses could modify the terms of the agreement at any time.

We hope this letter enriches your knowledge of our constitutional system and promotes mutual understanding and clarity as nuclear negotiations progress.