AP/Rick Bowmer
Cruz, a 2016 presidential candidate, has repeatedly warned in recent days that the agreement would mean President Barack Obama's administration is essentially sponsoring terrorism.
"If this deal goes through, the Obama administration will become the leading financier of terrorism against America in the world," Cruz said in a July 15 Fox News interview, for example.
He added: "I've heard this referred to before as the 'Jihadist Stimulus Bill.'"
But Romney argued on Twitter that Cruz's comments undermine the opposition to the deal:
I am opposed to the Iran deal, but @SenTedCruz is way over the line on the Obama terrorism charge. Hurts the cause.
- Mitt Romney (@MittRomney) July 30, 2015
Just interviewed @tedcruz. The interview will air at 10:05am. Tax reform, Iran, and more. Cruz had a few things to say about Bush & Romney.
- Chad Hasty (@ChadHastyRadio) July 30, 2015