Barney Frank was one of the people most responsible for overhauling financial regulation after the 2008 economic crisis. After retiring from Congress, he supported a change to his own law that would benefit midsize banks, and joined the board of such a bank. Last week, that bank failed. David Enrich called Mr. Frank and asked him to explain.Guest: David Enrich, the business investigations editor at The New York Times.Background reading: 

• Officials with Signature and Silicon Valley banks, which regulators seized in recent days, had called for looser financial requirements for midsize banks.
• Here’s why people are worried about banks.

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