Suffolk County voters have approved a controversial GOP proposal to double county legislators’ terms from two to four years — setting up a legal showdown as local Democrats move to overturn the results.

The proposed term extension , approved under last week’s ballot Proposition 2, included the stipulation that the county lawmakers elected this year will serve three-year terms before they face re-election in 2028, to line up with the timing of of races for other offices.

A new state law recently changed local election years to align with presidential elections.

But Democratic leaders claim the Suffolk referendum is unconstitutional since it would alter the terms of candidates who were voted into office last week for a two-year stint, and they are vowing to challenge it in court.

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