The GOP's 2016 contenders aren't just rallying behind a controversial letter Senate Republicans sent to Tehran. Many are eager to affix their signatures.
Most potential Republican presidential candidates are expressing support for the letter signed by 47 GOP senators, warning Iran that the next president could easily undo any nuclear agreement brokered by President Obama if it is not approved by Congress.
The letter, written by Sen. Tom Cotton of Arkansas, already includes the names of four senators who are considering White House campaigns: Ted Cruz, Rand Paul, Marco Rubio, and Lindsey Graham.
From outside Washington, Louisiana Gov. Bobby Jindal was the first to weigh in Tuesday, calling on all prospective presidential candidates in both parties to sign on.
"[E]very single person thinking about running for president, on both sides, should sign on to this letter to make clear to Iran that they are negotiating with a lame-duck president," Jindal said in a statement. "Make no mistake—any Iran deal that President Obama makes is not binding on a future president."
Later Tuesday, Cotton's office announced that Jindal's name was added to the letter.
Former Texas Gov. Rick Perry also was quick to announce he would aid the effort, tweeting, "I would be proud and honored to sign the letter @SenTomCotton has put forward on Iran." Cotton tweeted back, "I welcome your signature!"