Failed Delaware Republican Senate candidate Christine O'Donnell, who is being investigated by federal authorities to determine if she used campaign funds to pay personal expenses, said on Thursday morning that allegations against her were politically motivated.

"There's been no impermissible use of campaign funds whatsoever," she said on Good Morning America Thursday, adding, "You don't need a tipster to show that this was politically motivated. We were informed that the Delaware political establishment was going to use every resource available to them, including launching phony investigations... tying me up with lawsuits to make sure I can't move forward politically. I even expect more things to come, that's their tactic."

Federal authorities are trying to determine whether O'Donnell spent $20,000 of her campaign money on personal expenses and rent.

From The Associated Press report:

One former O'Donnell staffer, Kristin Murray, recorded an automated phone call for the Delaware Republican Party just before the primary, accusing O'Donnell of "living on campaign donations — using them for rent and personal expenses, while leaving her workers unpaid and piling up thousands in debt."

Another former aide, David Keegan, said he became concerned about O'Donnell's 2008 campaign finances as she fell behind on bills and had no apparent source of income besides political contributions. He submitted an affidavit to CREW alleging that she used campaign money to cover meals, gas, a bowling outing, and rent to a landlord, Brent Vasher.

The case, which has not yet been brought before a grand jury yet, is being looked into by two federal prosecutors and two FBI agents in Delaware, The Huffington Post reports.

In a statement released Wednesday, O'Donnell said:

"We've been warned by multiple high-ranking Democrat insiders that the Delaware Democrat and Republican political establishment is jointly planning to pull out all the stops to ensure I would never again upset the apple cart. Specifically they told me the plan was to crush me with investigations, lawsuits and false accusations so that my political reputation would become so toxic no one would ever get behind me. I was warned by numerous sources that the DE political establishment is going to use every resource available to them."

Read the full statement here and watch video of O'Donnell's appearance on Good Morning America here.