WARSAW, June 13 -- President Karol Nawrocki has vetoed more bills than any Polish head of state in the country's post-communist history, blocking his 37th piece of legislation barely ten months into a term he has turned into a standing obstacle to Prime Minister Donald Tusk's government.

The milestone, reached on Friday, surpasses the previous record of 35 vetoes set by Aleksander Kwasniewski across a full decade in office. Nawrocki has matched and beaten it in under a year, striking down a bill on average every eight days since he was sworn in last August.

His three latest rejections were characteristically broad: a framework for regulating crypto-assets, knocked back for the third time; a health bill that would have eased language req...