His words are quoted by the "Polish Press Agency".
The head of the Polish government also said that Polish representatives are persuading their colleagues in the EU to impose sanctions on companies that deliver migrants to Belarus.
Earlier, Morawiecki, commenting on the situation with refugees on the border with Belarus, said that the security of the Polish border was subjected to a "tough attack" for the first time in 30 years.
The Ministry of Defense of Belarus reported that it had summoned a military attaché at the Polish Embassy in Minsk in connection with groundless accusations of the involvement of the Belarusian military in the migration crisis.