"The first test will be a vote of confidence, which I will request in parliament soon," Tusk said in a televised address to the nation on Monday.
"I want everyone to see—including our opponents, both at home and abroad—that we are prepared for this situation. We understand the gravity of the moment, but we have no intention of taking even a single step back," he added.
Conservative opposition candidate Karol Nawrocki narrowly won the presidency, dealing a major blow to Tusk’s pro-European government.
Nawrocki, a pro-Trump Euroskeptic, captured 50.89 percent of the vote to Trzaskowski’s 49.11 percent, according to final results from the National Electoral Commission. Turnout was 71.63 percent.
Tusk had warned ahead of the runoff that a low turnout among pro-democracy voters could tip the race in Nawrocki's favour.
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Source: IAR, PAP