Barney Frank, the longtime liberal Democratic lawmaker from Massachusetts who helped shape one of the most sweeping financial reform laws in modern American history, died Tuesday night after suffering from congestive heart failure. He was 86.

“He was, above all else, a wonderful brother,” Frank’s sister, Doris Breay, told NBC10 Boston Wednesday morning in confirming her sibling’s passing. “I was lucky to be his sister.”

Born in 1940 in Bayonne, New Jersey, Frank built a political career that spanned more than three decades in Congress, becoming one of the nation’s most recognizable liberal voices on issues ranging from abortion rights and environmental policy to banking oversight and economic regulation.

After the financial collapse of 2007 and 2008, Frank partnered with then-Sen. Chris Dodd of Connecticut to develop the Dodd-Frank Wall Street Reform and Consumer Protection Act, the far-reaching legislation designed to curb abuses in the financial sector and strengthen protections for consumers.

The law introduced several major structural changes to the American financial system. It established the Consumer Financial Protection Bureau, created the Financial Stability Oversight Council to monitor systemic threats to the economy, and put procedures in place intended to prevent future taxpayer-funded rescues of failing financial giants through the Orderly Liquidation Authority.

Another key provision of the legislation was the Volcker Rule, which barred major banks from using depositor money for speculative trading and imposed stricter Federal Reserve supervision over the nation’s largest financial institutions.

President Barack Obama signed the legislation into law in 2010.

Frank’s years in public office also included personal and political scandals.

President Trump openly criticized Frank over the years and once mocked his appearance in a post on X after Frank delivered remarks on the House floor in 2011 while wearing a blue crew-neck shirt with a jacket draped over his shoulders.

“Barney Frank looked disgusting … in his blue shirt before Congress. Very very disrespectful,” Trump wrote in a post.

Only weeks before his passing, Frank spoke candidly with Politico about his declining health and his acceptance of death.

“At 86, I’ve made it longer than I thought. At some point, my heart’s just going to give out, and it’s reaching that stage. So I’m taking it easy at home and dealing with it by relaxing.”

Frank’s final book, “The Hard Path to Unity: Why We Must Reform the Left to Rescue Democracy,” is scheduled for release on Sept. 15. In it, he sharply criticized elements of the progressive movement, arguing that Democrats damaged themselves politically by shifting attention away from economic inequality toward social and cultural positions that many voters reject.