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Texas Attorney General Ken Paxton announced Thursday that he was opening an investigation into San Antonio's decision to exclude Chick-fil-A from a contract with the city’s airport over the company’s religious beliefs.

Paxton sent a letter to San Antonio City Council members and Mayor Ron Nirenberg, saying that he believed the first amendment was “under assault” over the city’s decision last week to exclude Chick-fil-A from a concessions contract with San Antonio International Airport because of what one council member called its “legacy of anti-LGBT behavior.”

“The Constitution’s protection of religious liberty is somehow even better than Chick-fil-A’s chicken. Unfortunately, I have serious concerns that both are under assault at the San Antonio Airport,” the letter read.

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Paxton directed the AG’s office to open an investigation into whether the city’s action violated state law.

He also sent a letter to Secretary of Transportation Elaine Chao asking for the department to investigate whether the motion also violated federal laws.

“The city’s decision to specifically exclude Chick-fil-A from a government program based on the sincerely held religious beliefs of its leadership raises serious constitutional questions,” Paxton’s letter to the DOT stated.

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“There is no evidence indicating that Chick-fil-A has ever maintained any policy or practice of discriminating against any group of people, and the city offered no such evidence as the basis of its action.”

The Atlanta-based fast-food chain has faced opposition elsewhere over donating millions over the years to groups that oppose same-sex marriage. Paxton has made religious freedom battles a focus of his office since being elected in 2014.