SAN DIEGO (AP) — Donald W. Riegle, who represented Michigan in Congress for nearly three decades under seven presidents, has died, his family said Sunday. He was 88.

Riegle, who began his career as a Republican and later became a Democrat, died Friday of cardiac arrest at his home in San Diego, according to a family statement.

“The cornerstone of our family, Don was a kind, loving, courageous leader who taught us to stand up for justice, economic opportunity, and fairness for everyone,” the statement said.

His family said Riegle was proud of fighting for the rights of working people and leading the Senate opposition to NAFTA, the North American Free Trade Agreement that resulted in the loss of many jobs in his home state. He pushed for economic development and the expansion of health insurance in Michigan.

The native of Flint, Michigan, was first elected to the U.S. House of Representatives as a Republican in 1966 at age 28. As a congressman, he challenged President Richard Nixon’s policies on the Vietnam War and crossed the aisle to join the Democratic Party in 1973. Three years later, he was elected to the U.S. Senate, where he served until 1994.

As chair of the Senate Banking Committee, Riegle pushed for financial reforms of the savings and loan industry. Later he was instrumental in getting treatment for Gulf War syndrome for military veterans who fought in the Persian Gulf in 1991.

Riegle was caught up in the Keating Five controversy, when he and four other senators faced Ethics Committee hearings in 1990 about whether they pressured federal regulators to go easy on savings and loan kingpin Charles Keating after receiving campaign contributions from him. The committee found Riegle did not break any federal laws or Senate rules, but determined his conduct gave the appearance of being improper.

In 2001, Riegle became chairman of government relations for public relations firm APCO Worldwide.

In retirement, he spent time with his grandchildren and other family at his homes in Michigan and California, his family said. His wife of 48 years, Lori Hansen Riegle, was by his side when he died, the statement said.

Memorial services are pending.

The Associated Press