The move by President of Poland Andrzej Duda came with the intent of preventing illegal migration from Belarus, after nearly 3,500 illegal migrants attempted to cross the border in August alone.
Chief justice Julia Przylebska said in a ruling that existing legislation which allows for the abortion of malformed foetuses was "incompatible" with the constitution.
President Andrzej Duda won 51.03 percent of votes in the July 12 election runoff. Most opposition leaders didn't attend the swearing-in ceremony showing their disapproval of what they call Duda’s disregard for the Constitution during his first term.
With 99.97 percent of ballots counted, Poland's national election commission says Duda has won 51.21 percent of the vote, with his liberal rival Rafal Trzaskowski bagging 48.79 percent.
Poland votes in a knife-edge presidential election between populist incumbent Andrzej Duda who is closely allied with US President Donald Trump and a europhile liberal Rafal Trzaskowski who wants to restore ties with Brussels.
Poland's President Andrzej Duda comes top in first round of presidential election, partial results show, but falls short of overall majority needed to avoid what looks set to be a tight run-off vote against Rafal Trzaskowski on July 12.
Poles began voting in a presidential election while the French are voting in the second round of municipal elections in 5,000 towns and cities.
Ahead of the vote, President Andrzej Duda visited Washington where he received words of encouragement from US President Donald Trump who said he was doing a "terrific job".
It was the first time in almost 31 years of Polish democracy that voting for the election in line with the constitution, scheduled for Sunday, did not take place. The speaker of parliament now has two weeks to announce a new date.
After British Prime Minister Boris Johnson's admission to an intensive care unit, many world leaders are wishing a quick recovery.
European Union leader Donald Tusk announced that he won't run to be the president of his native Poland, saying he carries too much "baggage" from his time as prime minister.
German President Frank-Walter Steinmeier has asked Poland's forgiveness during a ceremony to mark 80 years since the start of World War II in the Polish city of Wielun. Nearly six million Poles died in the conflict.
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