Pope Francis has postponed a trip set for next month due to medical concerns.

The pope's planned trip to Lebanon for June 12-13 has been postponed, according to Reuters. The delay appears to be due to the pope struggling to walk, according to two unidentified sources.

Francis has been struggling with a flare-up of pain in his right knee, which has impaired him for the last few weeks. Francis has also dealt with sciatica for several years.

Francis was seen in a wheelchair during a public appearance on Thursday. He did not allow the wheelchair to delay his schedule but continued meeting with several officials. Francis was in the wheelchair "due to the knee pain" because "doctors have advised him to rest his limb," according to the Holy See Press Office.

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While the Vatican did not announce the trip, Francis has referred to his plans to visit Lebanon in recent interviews.

Francis was scheduled to travel from Lebanon to Jerusalem to meet with Russian Orthodox Church Patriarch Kirill, but the visit was canceled due to the war in Ukraine.

The Lebanon trip will likely take place after the summer, one source said.

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Francis made news last week when he alleged that Hungarian Prime Minister Viktor Orban told him that Russian President Vladimir Putin would end his invasion of Ukraine on Monday. Putin has not done so, instead justifying the war during a speech on Russia's Victory Day.