"The explanation may be that in the eyes of Jaroslaw Kaczynski, Beata Szydlo turned out to be too weak and that the government was seeded by internal conflicts and factional struggles", Domanski said.
PiS party spokeswoman, Beata Mazurek later told reporters that its "political committee has proposed the candidature of ex-banker Mateusz Morawiecki for prime minister".
Poland's governing Law and Justice (PiS) party has named finance minister Mateusz Morawiecki to replace prime minister Beata Szydło, who tendered her resignation on Thursday as the administration gears up for a series of elections in the coming years.
Earlier Thursday, Szydlo and her Cabinet easily survived a no-confidence vote in parliament called by the opposition centrist Civic Platform party, which accuses the government of harming Poland with laws that it says are anti-democratic.
Germany's Lufthansa plans to open in Poland in co-operation with MTU Aero Engines an engine servicing plant worth 150 million euros that is to start functioning in 2020 and employ 800 people, Puls Biznesu reported.
Szydło said in a media interview on Wednesday that next year Poland's ruling conservatives planned to focus on policies to further improve the economy and ensure even faster growth to consolidate the country's "historically lowest unemployment, the best results in terms of economic growth in six years, and the best results in terms of public finances".
Sources told Reuters this week that Morawiecki, 49, was the most likely candidate to replace Szydlo, 54, to prepare the party - led by Jaroslaw Kaczynski, Poland's paramount politician - for elections due in the next three years.
Two bills are set for a final vote in parliament Friday that would give the government greater control of the judicial system.
Szydło added that she was keeping her fingers crossed for Morawiecki and for "other ministers responsible for the economy, for the entire government".
"The last two years - it was an extraordinary time for me and the service to Poland and Poles was an honor", Szydlo said on Twitter after the decision of her replacement was announced in the evening.
Poland's conservative ruling party says Prime Minister Beata Szydlo has resigned and will be replaced by Finance Minister Mateusz Morawiecki.
The EU has said the Polish reforms pose a "systemic threat" to the rule of law, with Brussels having warned it could trigger Article Seven of the EU's treaties - the so-called "nuclear option" that freezes voting rights.
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