The U.S Conference of Catholic Bishops (USCCB) on Thursday vowed to oppose “unjust” laws.

In its Statement of Religious Liberty, the bishops are calling for Catholics to participate in a “great national campaign” to defend religious liberty. The “A Fortnight for Freedom” calls for “all the energies the Catholic community can muster” to resist “totalitarian incursions against religious liberty” from June 21 to July 4.

Religious liberty, the bishops said, is “under attack, both at home and abroad.”

“To be Catholic and American should mean not having to choose one over the other,” the statement reads in part.

Among the seven examples of what they say are violations of religion freedom is not being allowed to refuse placement of children with foster or adoptive gay couples.

“Boston, San Francisco, the District of Columbia, and the state of Illinois have driven local Catholic Charities out of the business of providing adoption or foster care services – by revoking their licenses, by ending their government contracts, or both – because those Charities refused to place children with same-sex couples or unmarried opposite-sex couples who cohabit,” the bishops wrote.

The USCCB is headed by Cardinal Timothy Dolan, a vocal opponent of New York's gay marriage law, and last year launched a campaign opposed to marriage equality.