VATICAN CITY — Pope Francis and Ecumenical Patriarch Bartholomew, the spiritual leader of the world’s Orthodox Christians, will visit the Greek island of Lesbos next week to highlight the plight of refugees, the Greek government said, as refugees and other migrants are being deported back to Turkey under the European Union’s controversial program to ease Europe’s migrant problem.

Under the EU’s deal with Turkey reached last month, those arriving on Greek islands from March 20 onwards who do not apply for asylum in Greece or whose application is rejected or deemed inadmissible will be deported back to Turkey. For every Syrian returned to Turkey, another Syrian there will be relocated to a European country.

But after the initial return of 202 people Monday from the islands of Lesbos and Chios, most of the roughly 4,000 people earmarked for deportation were submitting asylum applications, leading to delays in the system.

No deportations were carried out Tuesday, and a Turkish interior ministry official said no further returns were expected until Friday. The official spoke on condition of anonymity because he was not authorized to speak on the record.

Francis, the son of Italian immigrants to Argentina, has been outspoken about Europe’s moral obligation to welcome refugees and his visit to Greece will likely embarrass EU leaders already under fire from human rights groups over the deportations.

The Holy Synod of the Church of Greece, the decision-making body of the Greek church, said Francis had asked to come to highlight the plight of refugees. It said the request had been accepted and the island of Lesbos suggested, adding it had also extended an invitation to Ecumenical Patriarch Bartholomew, the spiritual leader of the world’s Orthodox Christians, to visit the island on the same day.

The Istanbul-based Ecumenical Patriarchate confirmed Bartholomew would visit the island.

Vatican spokesman the Rev. Federico Lombardi said Tuesday that no decision had been made.