The protesters began gathering after the court posted information on its website saying its president, Bogdan Swieczkowski, had been suspended.
Shortly afterwards, the country's president, Karol Nawrocki, announced that he was canceling his planned trip to Senegal in response to the events.
Poland's highest judicial bodies, including the Constitutional Court, have been a flashpoint between the current pro-European government and the main opposition party, the nationalist Law and Justice (PiS).
Critics in Poland and the EU accuse PiS, which led the country from 2015 to 2023, of taking control of judicial institutions. PiS's reforms led to EU sanctions against Poland.
When current Prime Minister Donald Tusk came to power in 2023, he promised to restore the independence of the judiciary. However, his government's initiatives have been blocked by two successive presidents close to PiS, including Nawrocki.
"Restoring the rule of law is our duty. After years of lawlessness under PiS rule, this is a difficult and sometimes painful process that requires action. There is no other way," Tusk wrote on X on Friday evening.
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