The Czechs are also siding with their eastern European ally after the European Commission threatened to strip Warsaw of voting rights after a series of judicial reforms.
Brussels claims the reforms, which sees the Polish government gain more control over the courts, are a threat to democracy.
But Hungary’s Deputy Prime Minister, Zsolt Semjen, today hit out at the decision.
He said: “We shall defend Poland in the face of an unjust, fabricated political procedure.”
Meanwhile, the Czech Prime Minister Andrej Babis, has claimed the crackdown will have a “negative impact” on the entire region.
The European Commission has given Warsaw’s Law and Justice (Pis) party three months to change reverse its reforms.
But Poland has remained steadfast and claimed like-minded allies such as Hungary would veto the ultimate sanction of suspending Poland’s voting rights in the bloc.
Theresa May also gave support to the beleaguered nation, stressing its constitution was its own affair.
In a thinly-veiled swipe at the EU, Mrs May stressed the reforms are a matter for Warsaw.
When asked about the Commission’s move to deploy the “nuclear option” under Article 7 of the 2009 Lisbon treaty, May said: “These constitutional issues are normally, and should be primarily a matter for the individual country concerned.”
Speaking alongside Polish Prime Minister Mateusz Morawiecki in Warsaw, Mrs May said: “Across Europe we have collective belief in the rule of law.
“I welcome the fact that Prime Minister Morawiecki has indicated that he will be speaking with the European Commission and I hope that that will lead to a satisfactory resolution.”
Since coming into power in 2015, PiS has quarrelled with Brussels over its push to assume more control over courts and public media, as well as migration policy.
Budapest said on Tuesday that the latest move by the commission violated Poland’s sovereignty .
Germany and other Western powers threw their weight behind Brussels, which argued that Polish ruling party leader Jaroslaw Kaczynski’s push to have control of judicial appointments poses an “existential” threat to EU norms.
In a statement yesterday, the Commission said: “The commission has today concluded that there is a clear risk of a serious breach of the rule of law in Poland.
“Judicial reforms in Poland mean that the country’s judiciary is now under the political control of the ruling majority.
“In the absence of judicial independence, serious questions are raised about the effective application of EU law.”