Hillary Clinton is trying to cement her front-runner status in the race for the Democratic nomination by attacking her main rival, Bernie Sanders, on some of the key issues affecting the middle class.

During a campaign stop on Tuesday at Mountain View College, a community college south of downtown Dallas, the former secretary of state focused on families' pocket books. She said her challenger would have to raise taxes to support the proposals he has made throughout his campaign, CNN reported.

"I was actually the only one on that debate stage on Saturday who will commit to raising your wages and not your taxes," Clinton said. "I can't see how you can be serious about raising incomes if you also want to slap new taxes on them, no matter what the taxes would pay for."

Sanders, for his part, quickly shot back, asserting that any tax hikes would be justified because of the additional benefits citizens were bound to receive as a result, the news channel noted.

"On Medicare for all, the middle class would be far better off because it would save taxpayers money," Sanders spokesman Michael Briggs retorted on Tuesday. "More people would get better care at less cost. Didn't [Clinton] used to be for that?"

Clinton also attacked Sander's health care plan. The senator has suggested replacing the current system and replacing it with a Medicare-for-all approach, turning the system over to the states, The Associated Press noted.

"We should be working to build on it. Yes, does it need to be improved? Absolutely," Clinton said about the status quo. "[But] one thing we should not do is follow a proposal that has been made by one of my opponents," suggesting Sanders' proposals would empower Republican governors, including Texas' Greg Abbott.

But once again, Briggs accused the Democratic front-runner of flip-flopping on her previous positions.

Under Sanders' plan, "pharmaceutical companies would no longer be able to rip off Americans with the most expensive prescription drugs in the world," he insisted. "Didn't [Clinton] used to be for that?"