Republican presidential candidate and former Florida Gov. Jeb Bush wants everyone to know he is one tough cookie. He told Bloomberg News on Saturday that he eats nails when he wakes up — and then has breakfast.

Bush was campaigning in Des Moines, Iowa over the weekend — along with GOP rival Sen. Marco Rubio (FL).

Bush said he has “enough humility” to know he has to get better in his campaign. His struggling bid for the presidency resulted in a downsizing of his staff and slashing of his payroll. His campaign’s chief operating officer, Christine Ciccone, also resigned.

Bloomberg asked Bush if people were underestimating his ability to make a comeback in the GOP race.

“They don’t know me. They don’t know me,” Bush told Bloomberg. “I eat nails when I wake up, then I have breakfast.”

Bush also discussed his performance at the CNBC debate Wednesday and noted that he “felt it wasn’t that good” because he didn’t get to ask the right questions and didn’t interrupt his opponents.

Bush said he had not seen the debate video, but was sure “someone will make me watch it.”

Watch Bush’s comments: