VIDEO: Senate Republicans Go Over Obama's Head, Warn Iran Against Cutting a Deal

"It has come to our attention that you may not fully understand our Constitutional system," Senate Republicans explain in a letter addressed to Iranian leadership in the wake of Israeli Prime Minister Netanyahu's impassioned speech to Congress last week.

Penned by Arkansas Senator Tom Cotton, the letter is a stark warning to the leaders of Iran and a massive slap in the face to President Obama. Obama shot back in disapproval, attempting to equate the Republican Senators who signed the letter with the "hardliners in Iran".

Rubio, Cruz and Rand Paul, all considered contenders for the Republican Presidential nomination were among the 47 Senators who signed the letter. The following Republican Senators did not sign: "Lamar Alexander of Tennessee, Dan Coats of Indiana, Thad Cochran of Mississippi, Susan Collins of Maine, Bob Corker of Tennessee, Jeff Flake of Arizona and Lisa Murkowski of Alaska."