What is decided in the Senate and why it is important for the PSOE and the PP to control it

The upcoming Senate elections on November 29 are crucial as they determine control over legislative processes and government oversight. The PP's absolute majority has allowed it to act as a significant counterbalance to the government, utilizing legislative mechanisms to influence key decisions. In response to a joint list agreement between PSOE and the Left to prevent PP's dominance, both PP and Vox are negotiating to maintain their influence. The Senate's election process favors majoritarian outcomes, making block unity essential to avoid splitting votes. The Senate holds significant powers, including legislative approval, budget examination, and the ability to intervene in regional governance, making control over it highly contested.