"I resign from my position as Speaker of the House of Representatives, effective Friday, Aug. 2, at 8 a.m.," Casada said in the letter.
Casada's move to resign comes weeks after allegations came to light regarding his participation in inappropriate text messages with his former chief of staff, Cade Cothren, as well as the aide’s admission that he had previously used illegal drugs in the legislative office building. The House Republican caucus voted to signal “no confidence” in his leadership May 21.
In the letter, Casada also said he has requested for Gov. Bill Lee to call for a special session Aug. 2, during which time the House of Representatives is expected to elect a new speaker.