The developers of the proposed planned community tied to the East Plano Islamic Center, which has not yet been built, have said they are being bullied because they are Muslim.
The Justice Department did not immediately respond to a request for comment or to confirm Cornyn’s announcement.
A federal probe would further escalate pressure on the proposed EPIC City, which is already facing mounting criticism and multiple investigations from Republican Gov. Greg Abbott and other GOP state officials who claim the group is trying to create a Muslim-exclusive community that would impose Islamic law on residents.
Among its chief critics is the state's hard-right Attorney General Ken Paxton, who is challenging Cornyn for his Senate seat in 2026.
“Religious discrimination and Sharia Law have no home in Texas," Cornyn wrote in his post on X. “Any violations of federal law must be swiftly prosecuted, and I know under (President Donald Trump’s) administration, they will be.”
Dan Cogdell, an attorney for EPIC City who defended Paxton in his 2023 impeachment trial when he was acquitted by the state Senate, said the developers have "done nothing illegal and we will cooperate fully with all investigations-regardless of how misguided and unnecessary they are."
The state investigations include whether the development is violating financial and fair housing laws and whether the mosque has conducted illegal funerals.
Cogdell has said none of the investigations would be happening if the community was planned around a church or temple.
The attacks on the project about Islamic law and other claims “are not only completely without merit and totally misleading but they are dangerous as well,” Cogdell said Friday. “These folks are US Citizens, law abiding and Texans.”
The Council on American-Islamic Relations in the Dallas area also has criticized the state probes as bullying the Muslim community and a violation of constitutionally protected religious expression.
Plans for the mixed-used development include more than 1,000 homes and apartments, a faith-based school for kindergarten through 12th grade, a community college, assisted living for older residents and athletics fields.
EPIC City would be near the community of Josephine, about 30 miles (48 kilometers) northeast of Dallas.