BUDAPEST, Hungary (AP) — An aspiring challenger to Hungarian Prime Minister Viktor Orbán renewed his calls for change Friday as he led a protest of several thousand people demanding a more robust child protection system and the resignation of Orbán’s government.

The demonstrators gathered outside Hungary’s Interior Ministry in Budapest and called for its head, Sándor Pintér, to step down over what they see as his failure to prevent the sexual abuse of children in state-run institutions, a crime which has led to political upheaval in Hungary in recent months.

Peter Magyar, a 43-year-old lawyer who has emerged as a new voice of opposition to Hungary’s right-wing government, took aim at Orbán’s portrayal of himself as a defender of families and traditional values, and called for genuine reforms to address child welfare.

“We have a government that claims to be family friendly. It is a government that pretends to be Christian. A government that lies about being child-friendly. A government that lies about being pro-peace,” Magyar told the crowd. “The opposite is true. They lie in the morning, they lie at night, they lie everywhere they can.”