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Catalonia parliament to vote on secession from rest of Spain in defiance of central government

  • A man wraps with a Spanish flag during a demonstration calling for the "unity of Spain" in Barcelona, Spain, Thursday, Nov. 5, 2015. Three anti-independence parties filed complaints Wednesday before Spain's Constitutional Court against moves by the regional parliament of Catalonia to announce the formal start of independence from Spain. (AP Photo/Manu Fernandez)

    A man wraps with a Spanish flag during a demonstration calling for the "unity of Spain" in Barcelona, Spain, Thursday, Nov. 5, 2015. Three anti-independence parties filed complaints Wednesday before Spain's Constitutional Court against moves by the regional parliament of Catalonia to announce the formal start of independence from Spain. (AP Photo/Manu Fernandez)  (The Associated Press)

  • Popular Party of Catalonia, right, show Spanish flags and Catalonia flags at the end of a parliamentary session at the Parliament in Barcelona, Spain, Monday, Nov. 9, 2015. The regional parliament of northeastern Catalonia is due to vote on a proposal by secessionist parties that hold a majority in the chamber to set up a road map for independence from Spain by 2017. The initiative defies Spain's central government, which considers it unconstitutional. (AP Photo/Manu Fernandez)

    Popular Party of Catalonia, right, show Spanish flags and Catalonia flags at the end of a parliamentary session at the Parliament in Barcelona, Spain, Monday, Nov. 9, 2015. The regional parliament of northeastern Catalonia is due to vote on a proposal by secessionist parties that hold a majority in the chamber to set up a road map for independence from Spain by 2017. The initiative defies Spain's central government, which considers it unconstitutional. (AP Photo/Manu Fernandez)  (The Associated Press)

  • Regional acting president Artur Mas leaves parliament in Barcelona, Spain, Monday, Nov. 9, 2015. The regional parliament of northeastern Catalonia is due to vote on a proposal by secessionist parties that hold a majority in the chamber to set up a road map for independence from Spain by 2017. The initiative defies Spain's central government, which considers it unconstitutional. (AP Photo/Manu Fernandez)

    Regional acting president Artur Mas leaves parliament in Barcelona, Spain, Monday, Nov. 9, 2015. The regional parliament of northeastern Catalonia is due to vote on a proposal by secessionist parties that hold a majority in the chamber to set up a road map for independence from Spain by 2017. The initiative defies Spain's central government, which considers it unconstitutional. (AP Photo/Manu Fernandez)  (The Associated Press)

The regional parliament of northeastern Catalonia is due to vote on a proposal by secessionist parties that hold a majority in the chamber to set up a road map for independence from Spain by 2017.

The initiative defies Spain's central government, which considers it unconstitutional. A debate preceding the vote is set to begin at 0900 GMT (4 a.m. EST) Monday.

Prime Minister Mariano Rajoy's government has pledged to take legal action against the Barcelona-based parliament if it approves the proposal.

Although Catalan branches of Spain's ruling conservative Popular Party and the Socialist and the Citizens opposition parties filed appeals to halt the vote, Spain's Constitutional Court ruled Thursday that it could go ahead.