Donald Tusk announced the measure before a Cabinet meeting, Polish state news agency PAP reported.
"We have decided to restore temporary controls on the borders between Poland and Germany and between Poland and Lithuania," Tusk said.
He added: "The decision was made today. For organisational reasons, it will come into effect on Monday, July 7."
He told reporters that the Polish Border Guard needed time to "prepare the operation logistically."
The announcement comes amid a growing political row over the handling of migration and border controls, particularly along Poland’s western border with Germany.
Opposition figures from the conservative Law and Justice party (PiS) and far-right Confederation party have accused the government of failing to control the border, and claimed that migrants are being pushed into Poland from Germany outside formal procedures.
Poland’s Interior Minister Tomasz Siemoniak on Monday rejected these claims, arguing that the number of migrants returned to Poland under readmission agreements in 2025 is significantly lower than in 2023 and 2024.
He also blamed previous policies under which he said unchecked entries into Poland were allowed on the assumption that the migrants would continue on to Germany.
"Now we are reaping the consequences of that approach," Siemoniak said. "A whole corridor was created through Poland."
He added that while the situation on the Polish–Belarusian border has improved thanks to tighter controls, pressure is now building on the Polish–Lithuanian border.
“Those who cannot cross from Belarus are now heading north and trying to get through that way,” he said.
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Source: IAR, PAP
Click on the audio player above for a report by Agnieszka Bielawska.