A lesbian teacher fired on her wedding day for marrying her partner of 14 years spoke out about the incident on Tuesday.

Shortly after Tippi McCullough and Barb Mariani tied the knot in New Mexico, McCullough, who has taught English at Mount St. Mary Academy, a Catholic all-girls school, for 15 years, received a phone call from the school principal, who reportedly offered McCullough the option of resigning her post or being fired.

At a press conference in Little Rock, Arkansas organized by the Human Rights Campaign (HRC), the nation's largest LGBT rights advocate, McCullough said that she was “devastated.”

“When I received the phone call of my firing, I was devastated,” McCullough said. “The first thought that went through my mind was how hurt I was that my 15-year commitment had been reduced to a mere label.”

McCullough said that colleagues at St. Mary Academy knew of her sexual orientation and that it had not been a problem until she married last Wednesday. She said that she would like to receive an apology from school officials.

More than 50,000 people have signed an HRC online petition calling on the school “to commit to ending discrimination against the school's LGBT employees and to apologize for the way Tippi was treated.”