Church leader that declared every church must agree with rome?

The church leader you are referring to is likely Pope Francis, who has emphasized the importance of unity among Christian denominations and has advocated for ecumenical dialogue with other churches. His approach encourages a collaborative relationship with non-Catholic churches, urging them to seek common ground with the Roman Catholic Church. While he hasn't mandated that every church must formally agree with Rome, his statements suggest a desire for greater alignment and mutual understanding among Christians.