Democrats and Republicans argued over whether or not it was right for 47 Republican lawmakers to sign and send a letter to the Iranian government. The letter conveyed the message that without approval from Congress, any deal worked out between Tehran and President Obama regarding Iran's nuclear program would only stand for as long as President Obama was in office. According to the Dallas Morning News, Senator John Cornyn, who signed the letter, defended it on Tuesday.

Cornyn said the problem isn’t with lawmakers who reject Obama’s effort to cut a deal with Iran; it’s with a “unilateralist” president who is trying to sidestep Congress on an issue with huge security implications.

He called the letter, written and organized by Sen. Tom Cotton, R-Ark., appropriate and accurate.

“All the letter does is explain that the president is constrained by our Constitution, something that he seems to overlook from time to time, and points out the fact that this deal, between Barack Obama and Tehran, without Congress voting on it is good for maybe the next 21 months,” Cornyn said.

“I don’t know what he’s afraid of. He’s asked the Congress to vote on authorization for the use of military force against ISIL, but then he doesn’t want any of our participation or ideas or debate with regard to something that’s arguably much more significant, and that is an Iranian nuclear weapon.”

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