Until Thursday evening, the 48-year-old opposition MP had been gone for almost two weeks.
He has reportedly not used his phones or bank cards since December 6 and failed to attend a court hearing three days later that ordered he be remanded in custody pending trial.
On Thursday, a Warsaw court issued a European arrest warrant, acting on information from the prosecutor’s office that he had fled to an EU country.
There were speculations that Mr. Romanovsky was hiding in Hungary.
Hungarian Prime Minister Viktor Orbán said on Thursday that the current Polish government treats Hungary as an enemy and will offer asylum to anyone facing political persecution in Poland.
Mr. Orbán and Poland’s Law and Justice party share ideological goals, even as they have diverged over Russia’s invasion and war against Ukraine.
They generally agree that what they see as the EU’s liberal elite is pushing Europe away from its Christian traditions and eroding the sovereignty of member states.
Mr Romanowski is reported to be a member of the conservative Catholic group Opus Dei, which earlier this week denied the MP was hiding with them.
In October 2022, he told a Polish Catholic radio station that LGBT+ is “institutionalized deviance.”
A year later, he advocated the death penalty, even for minors, after a 16-year-old boy was beaten to death by teenagers.
