Cruz escalates feud with ex-Iranian official working at Princeton: 'You should be deported'

"Your books are unreadable, and the only debate you should be having is with DHS agents, at the end of which you should be deported," Cruz quipped.

"If you do not accept this offer, I ask you to read some of the books and articles I have written over my 15 years of academic work at Princeton University," he wrote.

"You will see that all of them focus on establishing peace between Iran and the United States, introducing a peaceful resolution of Iran's nuclear crisis based on NPT, avoiding dragging America into another devastating war in the Middle East, promoting peace, stability, and security in the Persian Gulf, and making the Middle East free of weapons of mass destruction."

The ex-Tehran official said he had been arrested by Iran in 2007 and forced out of the country in 2009.

Fox News Digital reached out to Cruz, Mousavian and Princeton University for comment.

The letter expressed how Mousavian had been the Berlin ambassador during a time when "a German court found [it] served as the headquarters for the planning of the 1992 assassination of four Iranian dissidents" at a Greek restaurant in the capital.

"Did Princeton consult with U.S. government officials regarding the hiring of Mousavian?" they asked.

Fox News Digital's Benjamin Weinthal contributed to this report.