Jeb Bush is no Bernie Sanders, but he may not be Wall Street's best friend when it comes to taxes.

At Saturday night's Republican presidential debate, the former Florida governor addressed a part of his tax proposal that entails taxing carried interest at ordinary income tax rates instead of generally lower capital gains and dividends tax rates. Moderator Major Garrett pushed him on criticisms from the right-leaning Americans for Tax Reform, which believes no Republican should be for higher taxes on capital gains.

Bush's response? Sorry, not sorry.

He said that his proposal would not undercut his projection of 4% economic growth annually under his presidency and reiterated his stance.

"It's not just hedge fund people, but people that are doing -- they're in the business of investing other people's money, getting capital gains treatment is not appropriate," he said. "They should be paying ordinary income. That's their business."

Bush emphasized that he does plan to lower and simplify tax rates and reform the tax code, touting his record in Florida. But he was clear that his stance on the carried interest issue stands.

"It's not the end of the world that private equity people and hedge fund folks that are, right now, getting capital gains treatment for the income they earn, pay ordinary income like everybody else in this room," he said.

According to an analysis from the right-leaning Tax Foundation, Bush's tax proposal would lead to significant growth, including a 10% higher GDP over the long term, 28.8% larger capital stock, 7.4% higher wages and 2.7 million more jobs. The plan would cut taxes by $3.6 trillion over the next decade, but by the Tax Foundation's estimates, revenue would be reduced by only $1.6 trillion when accounting for the additional economic growth created. (The Tax Foundation essentially assumes tax cuts are a boon for the economy.)

Specific to Bush's carried interest proposal, the organization notes that taxing carried interest at ordinary income rates under current law would raise $1.3 billion per year. Under the governor's lower marginal tax rates, revenue impact would be smaller.

While in the Democratic primary, Sanders and Hillary Clinton have been hard-hitting on the subject of taking on Wall Street, on the Republican side, discussion of investments and the markets has been light this election season.

Even as market turmoil has increased in recent months, candidates have mostly avoided the topic. Not only is talking about it complicated, but it also doesn't gain points with voters.

The exception has perhaps been Donald Trump, who, while avoiding the topic on the debate stage, has mentioned it elsewhere. Just days ago, he contended on CNBC's Power Lunch that the market looks overvalued.

"I hope I'm wrong, but I think we're in a big, fat, juicy bubble," he said.

He's made similar statements in the past. In October, he toldThe Hill he is worried people are "being forced into an inflated stock market and at some point they'll get wiped out." In December, he said the market was in a bubble and hopes it will burst sooner rather than later. "I don't want to sound rude, but I hope if it explodes, it's going to be now, rather than two months into another administration," he said.