Story updated below with Hutchison's remarks as prepared for delivery on Saturday.
WASHINGTON (CNN) - Texas Sen. Kay Bailey Hutchison, who previously said she would resign her seat to run for governor, will announce Saturday she will remain in the Senate as she seeks the Republican Party’s gubernatorial nomination, a Hutchison aide tells CNN.
"She will announce tomorrow at the Texas Federation of Republican Women’s Convention in Galveston that she will not be resigning her seat before the primary,” said the aide, who spoke on the condition of anonymity. “She is running for governor because she feels it is important to fight on two fronts, for the race for governor and against the Democratic health care proposal and cap and trade.”
In July, Hutchison told Dallas radio station WBAP that she planned to leave the Senate in the fall.
"Then the actual leaving of the Senate will be sometime — October, November — that, in that time frame," she said.
The aide said that Hutchison “plans to resign” her Senate seat “after the primary,” which the aide noted she will win. The aide brushed off the question of whether she would quit if she ends up losing the primary to Gov. Rick Perry.
A Perry spokesman quickly responded to the latest news in what has been a contentious primary battle.
"We appreciate that Sen. Hutchison has taken the governor's advice and finally decided to make a decision to stay in Washington,” Perry spokesman Mark Miner said in a statement. “Hopefully this will allow her to be a full-time senator for the people of Texas."
UPDATE: A campaign aide passed along excerpts of the speech Hutchison will deliver tomorrow:
"I have said before that I intended to resign this fall after I worked to defeat the Obama health care bill," Hutchison will say. "I have not said the exact date for resignation because we were waiting for the Democrats to schedule the Senate debate.
"But the bill has now passed out of the House, taking us one perilous step closer to a government takeover of nearly one-third of our economy. We are a step closer to huge tax increases. To the loss of countless jobs. And the end of patient choice. The Democrats are going to pull out every stop to socialize American medicine. But we will fight it every step of the way. And it could be a long fight.
"I am more determined than ever to become the 48th Governor of the great state of Texas. But at the same time I must put what's best for my campaign aside and do what is best for our state. That is why I must stay in the Senate while running for the Republican nomination for Governor."