Tennessee House Speaker Glen Casada apologizes for text message controversies, pledges changes after some Republicans call for his resignation

Rep. Glen Casada, R-Franklin, center, talks with other members of the House including Rep. Charles Sargent, R-Franklin, left, during a debate on whether to override Gov. Bill Haslam's veto of a bill seeking to make the Bible the state's official book, Wednesday, April 20, 2016, in Nashville, Tenn. The House voted not to override the veto. (AP Photo/Mark Humphrey)

NASHVILLE - Republican House Speaker Glen Casada on Wednesday sought to head off a possible rebellion among GOP colleagues over a text-message scandal, apologizing to Republicans in a telephone conference call during which some members called for him to resign from his powerful post.

The speaker has come under fire over several issues, including text exchanges with his former chief of staff Cade Cothren, who resigned earlier this week amid a furor over the revelation of racist and sexually explicit texts he sent to Casada from 2014 to 2016, as well as Cothren's admitted use of cocaine in his office.

Outlining what he called an "action plan" aimed at restoring trust in his office, Casada promised to put things right, even after having earlier publicly questioned whether some of the texts had been fabricated.