Prime Minister Mateusz Morawiecki said on Facebook that the ban hit at the basic democratic values of freedom of speech and opinion and called it cyber censorship.
Poland PM Mateusz Morawiecki's appeal on Wednesday was made to a nation with a vaccination rate of just 54%.
Later on Sunday, the Polish head of government will meet his counterparts from the Baltic states -- two of which also share a border with Belarus -- to discuss the conflict.
Morawiecki faced less sanguine criticism from his Polish political opponents, many of whom are deeply worried about Poland's increasing isolation within the EU.
Polish PM Mateusz Morawiecki this week painted a picture of an overbearing union treating its 27 member nations as mere provinces, free to impose values at will against the wishes of sovereign people.
The ferocious row, played out in the European Parliament, underlined the seriousness of the issue which both Brussels and Warsaw say threatens the cohesion of the 27-nation bloc.
The coalition of the Law and Justice party and two junior partners now holds 229 out of 460 seats in parliament's lower chamber. It came to power in 2015.