Oral arguments on the constitutionality of the Defense of Marriage Act (DOMA), in the case of Gill v. Office of Personnel Management will begin on Thursday, May 6, according to a statement posted on the Gay & Lesbian Advocates & Defenders website.

The hearing will address whether DOMA is constitutional, six years after the first same-sex couples in the country began marrying in Massachusetts, resulting in GLAD’s groundbreaking marriage case, Goodridge v. Department of Public Health.

Mary L. Bonauto, GLAD’s Civil Rights Project Director, will argue the case on behalf of seven married same-sex couples and three widowers before U.S. District Judge Joseph L. Tauro.