MADISON, Wis. (AP) -- Republican Senate Majority Leader Scott Fitzgerald says he plans on challenging enough signatures on recall petitions to stop any election.

Fitzgerald said Tuesday he will also make a number of other challenges, including arguing that newly drawn legislative boundaries should have been in play for the collection of the signatures.

Thursday is the deadline for Fitzgerald and three other incumbent Republican senators to file challenges to the recall petitions.

Organizers collected about 20,600 signatures to recall Fitzgerald. They needed 16,742.

A spokesman for Senate Republicans would not say what challenges would be filed by the other senators. Fitzgerald says he doesn't know how many signatures they will contest.

The other targeted senators are Pam Galloway of Wausau, Van Wanggaard of Racine and Terry Moulton of Chippewa Falls.