ABC News’ Teddy Davis reports: In a change of plans, Sen. Kay Bailey Hutchison, R-Texas, is planning to announce on Saturday that she will hold onto her U.S. Senate seat as she continues to battle Texas Gov. Rick Perry in the March 2010 Republican gubernatorial primary. “Kay Bailey Hutchison is committed to fighting for Texas not only as a candidate for governor but also as a United States senator fighting against ObamaCare and cap-and-trade legislation which will be devastating for the state of Texas. She will not resign her Senate seat until these fights are over,” spokesman Joe Pounder told ABC News. Hutchison is planning to make her official announcement during a Saturday 10:00 am ET speech to the Texas Federation of Republican Women in Galveston, Texas. For the past year, Hutchison has said that she would resign her Senate seat in the fall of 2009 so that she could focus full-time on her gubernatorial campaign. Asked to explain the change of plans, her spokesman attributed it to the health-care battle dragging longer than originally expected. One upside to not resigning her seat is that she can continue to serve in the Senate even if she loses the March 2010 primary to Perry. Hutchison’s Senate seat is not up until 2012. If she wins the Texas GOP’s gubernatorial nomination, she will decide at that time if she wants to stay in the Senate or campaign full time. ABC News' Jacqueline Klingebiel contributed to this report.