Three men attached a rope around a statue of Monsignor Henryk Jankowski and pulled it down.
The blaze broke out at a venue in Koszalin on Friday afternoon.
It hands down prison sentences to people who connect the country to Nazi Germany.
Thousands rallied in the country's largest cities.
Since the fall of communism in 1989, every American president visiting Warsaw has stopped at the site.
The president stopped in Warsaw ahead of the G20 summit in Germany.
Faith matters, but so does culture.
VLADIVOSTOK, Russia -- Two years ago, I wrote that America was pushing Russia and China to form an anti-Western quasi-alliance, possibly recreating conditions that led to past conflicts. Unfortunately, things have only gotten worse since then.