Texas: Petitions taken out against Dallas mayor following party switch

Petitions appear to have been taken out against Dallas Mayor Eric Johnson over his party registration switch from Democrat to Republican (after a recent re-election win). Petitioner, a former council candidate, claims to have over 1100 signatures (though presumably this is on the original filing, not the actual petition that hasn't been approved). 

Note that the Dallas Mayoralty is a non-partisan election, so Johnson did not run as a member of a party.

Petitioners would need the signatures of 15% of registered voters in the last election in 60 days (103,000 signatures) to get on the ballot. The Secretary of State's office has the county info, so hard to tell how much that is as of yet. The law specifies the city council is subject to a recall, but it notes that the mayor is the 15th city council member (election in the city as a whole).