Bill Clinton rallies in Michigan ahead of Tuesday's primary

Former president Bill Clinton campaigned for his wife in Michigan on Saturday, days before the state primary.

At a rally in Detroit, he spoke on the need to overturn the controversial Supreme Court decision known as "Citizens United," which banned the government from putting a cap on political spending.

He also talked about his wife's proposal to change the way people pay for college loans. The former president said student loans are the only debt that people can't refinance. He said his wife's plan would give people the option to consolidate their debt into a mortgage-like loan -- to pay it off over 20 years at low interest rates -- based on their after-tax income.

The former president also met with union members from the American Federation of State, County and Municipal Employees, or AFSCME, which endorsed Hillary for president.