A House committee on Tuesday held a hearing on a so-called religious freedom bill that seeks to protect individuals opposed to marriage rights for gay and lesbian couples.

Democrats and LGBT rights advocates blasted House leaders for holding the hearing on the 1-month anniversary of a mass shooting in an Orlando gay nightclub, the Pulse, where 49 people died and dozens were injured.

“This hearing is deeply hurtful to a still grieving LGBT and allied community,” Jim Obergefell told Republicans on the House Committee on Oversight and Government Reform.

Obergefell was the lead plaintiff in the 2015 Supreme Court case that led to nationwide same-sex marriage.

The First Amendment Defense Act (FADA) was introduced on June 17, 2015 by Republican Senators Mike Lee of Utah and Paul Labrador of Idaho as a response to the high court's ruling. It seeks to bar federal “discriminatory action” against those who oppose such unions based on a “religious belief or moral conviction.”

“The Federal Government shall not take any discriminatory action against a person, wholly or partially on the basis that such person believes or acts in a religious belief or moral conviction that marriage is or should be recognized as the union of one man and one woman, or that sexual relations are properly reserved to such a marriage,” the bill states.

House Democratic Leader Nancy Pelosi called the hearing “a disgrace to our nation.”

“Exactly one month after 49 people were murdered in Orlando, House Republicans are convening a hearing on a bill that would use American tax dollars to discriminate against LGBT families and other Americans. House Republicans' shameful anti-LGBT bigotry is a disgrace to our nation, especially during this time of national mourning,” she said in a statement.

Former Congressman Barney Frank, who married his husband, Jim Ready, in 2012 while he was a member of the House, also testified at the hearing.

Frank said that the bill was “an expression of anti GLBT prejudice” in his opening statement.

The American Principles Project and the National Organization for Marriage (NOM) are among the groups lobbying Congress to move on the legislation.