Washington (CNN) - Two major speakers at next week's first Tea Party Convention are dropping out of the lineup.
Tennessee Rep. Marsha Blackburn and Minnesota Rep. Michele Bachmann announced Thursday that they will not be attending the convention, which is scheduled to start late next week in Nashville, Tennessee.
Blackburn was scheduled to serve as a featured speaker and also introduce the keynote speaker, former Alaska governor and 2008 GOP vice presidential nominee Sarah Palin.
Bachman was scheduled to serve as one of the convention's kickoff speakers. Both congresswomen are strong supporters of the tea party movement.
Blackburn's congressional office says the House Committee on Standards advised her not to participate in the convention, which is being put together by the Tea Party Nation as a for-profit entity. Tea Party Nation is run by Judson Phillips, a lawyer in Tennessee.
"I spoke to Judson Phillips this morning and let him know that I could not participate in the convention. I told him frankly that Tea Party Nation's for-profit status has put many of his speakers in an awkward position," Blackburn said in a statement.
"Standards advised Congressman Blackburn not to participate in the event due to uncertainty about how any proceeds from the event may be used. Convention organizers have not been clear about how those funds will be put to use. We have every indication that any profit could be put to work to advance grass roots causes and some of those uses could make the Congressman's participation improper after the fact," says Blackburn Communications Director Claude H. Chafin
It was a similar message from Bachmann's office.
"Due to conflicting advice on whether Representative Bachmann's participation in the upcoming Tea Party Nation Convention would be in line with the Committee on Standards, Congresswoman Bachmann has decided not to participate in the event. There is uncertainty about how any proceeds from the event may be used, and we must err on the side of caution," says Bachmann Press Secretary Debbee Keller.
"We regret that they are unable to attend, however we do not want them to be challenged by the committee or the Democrat led Congress," said Philips in a statement released Thursday afternoon.
Both congresswomen say the canceling of their speeches is not sign that their commitment to the tea party movement is fading.
"Some will want to portray her withdrawal as a repudiation of the Tea Party Movement, but that couldn't be further from the truth. Congresswoman Bachmann remains encouraged by all Americans, regardless of political party, who are concerned about this nation's future and dwindling prosperity, and continues to be inspired their passion," says Keller.
Blackburn says she remains encouraged by the "outpouring of energy from constitutionally minded grassroots organizations in Tennessee and around America.
These groups are not made up of Republicans or Democrats, but everyday Americans who are concerned about their freedom. They know that out-of-control spending and the expansion of government ultimately limits that freedom. I share their concerns and look forward to working with them in the future."
(Updated at 5:00 p.m. EST with statement from Tea Party Movement)