"Putin is a murderer and Trump is uncertain," Czarzasty, leader of Poland's left-wing New Left party, said during a meeting with voters in the eastern city of Lublin on Saturday.
Czarzasty, whose party is a junior partner in Prime Minister Donald Tusk's pro-EU government, said Poland needed to strengthen its armed forces and prepare for a worsening security environment.
"We must arm ourselves and we must be prepared," he said, amid concerns about intensified Russian hybrid warfare and Russian air strikes on areas of Ukraine near the Polish border.
Czarzasty said Poland's membership in the European Union was a key strength and warned that leaving the bloc, as advocated by some anti-EU politicians, would leave the country with "the East as its only alternative."
He described Trump as a friend of Poland but also "a leader of chaos," repeating a phrase that previously drew criticism from the US ambassador to Poland, Tom Rose.
Czarzasty said Warsaw needed to deal with the US president "as an equal partner."
He also called on President Karol Nawrocki, an ally of the right-wing opposition and a supporter of Trump, to use his ties with the White House to seek a permanent US military base in Poland.
Czarzasty also argued that Poland should put its historical grievances with Ukraine over World War II to one side while Ukrainians were fighting Russia, which he said was the main security threat to Poland and other European countries.
He said Poland was supporting Ukraine, which borders Poland to the southeast, with money and weapons and should continue doing so.
"The more time Ukraine gives us, the more time we have to arm ourselves, train our army and enter into alliances," he said.
Czarzasty said it was in Poland's national interest for Ukraine to remain independent and free.
Deputy Prime Minister and Digital Affairs Minister Krzysztof Gawkowski also spoke at the meeting, focusing on online security and disinformation.
Gawkowski accused Russia and Putin of seeking to destabilise Poland's information space.
He called on Nawrocki to sign legislation on internet safety that he said would give the government tools to remove hateful and illegal content online.
Gawkowski also said Poland was the European Union's most frequently attacked country in cyberspace and accused Russia and its allies of seeking to disrupt essential services.
Czarzasty and Gawkowski met voters in Lublin as part of the New Left's "Left-Wingers Deliver" series of regional conventions focused on Poland's security.
The party plans to visit two provinces each month ahead of next year's parliamentary elections.
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Source: IAR, PAP, TVP Info