Former President Bill Clinton William (Bill) Jefferson ClintonD-Day for Trump: September 29 Trump job approval locked at 42 percent: Gallup If Trump doesn't know why he should be president again, how can voters? MORE rallied supporters for his wife in Michigan on Saturday, days before the state heads to the polls.

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"There are basically two significant issues I think that are the difference in the primary," he told the crowd. "One is over healthcare, one is over how best to finance college education and debt."

"And I agree with her on both of those," he said to laughs from the crowd.

He attacked Sanders's plan to try to eliminate tuition for public universities, saying that it would do nothing to help those attending private colleges. Clinton also said that the plan wouldn't address state legislatures slashing funding to their universities as a way to save money.

He said the former secretary of State's plan to eliminate debt for students attending public universities and historically black colleges and universities would be much more fair. He added that wealthy families should continue to have to pay tuition.

"Only the top 10 percent of us have gotten a pay raise," the former president said.

He also called for legislation to give relief to those currently paying off student loans.

"Did you know student loan debt is the only type of debt you can't refinance?" he said to the crowd.

Clinton also said that Sanders's healthcare proposals to establish universal coverage aren't achievable considering the Democrats don't have control of Congress.