Tusk said Nawrocki had vetoed 45 laws during his first year in office and described his approach as based on the principle that "the worse it is, the better."
"The worse it is for Poland and for the government, the better," Tusk said in a video posted on X.
He said Nawrocki "does not hesitate to use the presidential prerogative in an absolutely unprecedented way."
Tusk said the constitution's authors had assumed that the presidential veto would be an exceptional tool used only in exceptional circumstances. He contrasted Nawrocki's 45 vetoes in his first year with the track record of former President Aleksander Kwaśniewski, who used the veto 35 times during his 10-year presidency.
He also cited former President Lech Wałęsa, whom he described as a combative president who did not always cooperate with the government but used the veto 27 times.
According to Tusk, Nawrocki's frequent vetoes were harming "the fundamental interests of the state" in an effort to hurt the government and strengthen the president's position.
Tusk said Poles were "painfully feeling" Nawrocki's "aspirations to wield powers beyond those provided for by the constitution."
Tusk also accused Nawrocki, without elaborating, of "supporting the interests of other countries" and taking "a more positive approach" where "someone else can make money off the Polish state."
The prime minister said the direct cost of Nawrocki's vetoes to date had exceeded PLN 8 billion (EUR 1.8 billion, USD 2 billion).
Tusk also accused Nawrocki of obstructive actions beyond his use of the veto, citing the president’s opposition to the appointment of the head of the State Protection Service (SOP), ambassadorial appointments and promotions of security service officers to their first officer ranks.
Tusk said Nawrocki's strategy "will certainly continue" and announced that the government would monitor what he called lobbying at the presidential palace.
"We will monitor this; the Polish state must defend itself against such practices," Tusk said.
He said the president needed to face constant pressure and pledged to provide it as prime minister.
"I will do that as prime minister. I will also do everything to take the negative tools out of his hands," Tusk said.
Tusk also appealed to the public to "make clear" to the president that "every time he vetoes and blocks" government efforts, "he is acting against the Polish people."