"Today, I submitted to the parliamentary Speaker a proposal for an amendment to the constitution that would enshrine the obligation to allocate at least 4 percent of GDP to defence," Duda told reporters in Warsaw.
Poland now spends a higher proportion of GDP on defence than any other NATO member, including the United States, the Reuters news agency reported.
Last year, Poland's defence spending reached 4.1 percent of GDP, according to NATO estimates.
Duda in January signed the country's budget for 2025, which expects defence spending to reach 4.7 percent of GDP this year.
The Polish president on Thursday formally requested that NATO leaders discuss raising defence spending to 3 percent of GDP at the alliance's upcoming summit in the Netherlands.
At a joint news conference with NATO Secretary-General Mark Rutte in Brussels, Duda warned that failing to strengthen the alliance’s deterrence capabilities could embolden Russia to expand its aggression beyond Ukraine.
"One thing is absolutely certain – if the entire North Atlantic Alliance does not increase its defense spending, then unfortunately, Putin may be tempted to attack again because there will not be sufficient deterrence," Duda told reporters alongside Rutte.
US President Donald Trump on Thursday reiterated doubts about defending NATO allies that fail to meet defence spending goals, telling reporters in the Oval Office: "If they don’t pay, I’m not going to defend them."
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Source: IAR, PAP, Reuters, polskieradio24.pl
Click on the audio player above to listen to a report by Michał Owczarek.