Rep. Curtis Johnson announces bid for Tennessee House speaker, pledges to 'restore credibility, trustworthiness'

Republican Reps. Mike Carter, of Chattanooga, left, and Curtis Johnson, of Clarksville, confer during a House floor debate, Tuesday, April 14, 2015, in Nashville.

NASHVILLE - State Rep. Curtis Johnson is telling fellow Republicans in a letter that he is running to replace Glen Casada as Tennessee's House speaker.

Casada has announced he plans to resign Aug. 2 following a scandal over explicit sexual texts and other issues.