As reported by Polskie Radio 24, he announced this during a speech on the occasion of the Independence Day celebrated in Poland.
Duda noted that the Border Guard, the Polish Army, the police and other services "are in a state of utmost readiness."
The Polish president thanked the representatives of the law enforcement agencies for their professionalism and dedication.
Earlier, Polish Prime Minister Mateusz Morawiecki said that Poland would close checkpoints on the border with Belarus if migrants attempt to storm.