Initiative promoter Tim Eyman is set to turn in signatures Friday in Olympia on a measure to reinforce a rule Washington voters previously approved, making it more difficult for the Legislature to raise taxes.

If passed, I-1185 would require a two-thirds majority in the Legislature or a vote of the people to create or raise taxes.

Voters approved the idea in 2010 with Eyman's Initiative 1053. Eyman says it needs to be renewed every two years or lawmakers could ignore it in January.

Initiatives require about 242,000 valid signatures from registered voters to qualify for the ballot.