The Spanish Senate is composed of 266 seats, with 208 determined by general elections and the remaining 58 designated by regional parliaments. Ahead of the general elections scheduled for November 29, 58 seats have already been assigned through this regional process.
Of these pre-assigned seats, the Partido Popular (PP) has secured at least 23, while the Partido Socialista Obrero Español (PSOE) has been allocated 19. This distribution establishes the baseline composition of the upper house before the electorate casts ballots for the remaining positions.
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