“If we did run into problems in markets, I think he would actually be the best person you could have in the job,” Buffett said, according to the transcript of an interview with Charlie Rose to be aired on PBS. “World leaders would have confidence in him.”

President Barack Obama is seeking to replace Treasury Secretary Timothy F. Geithner, who had said he planned to step down. Dimon, 56, testified before Congress and shuffled top managers this year after the bank disclosed a loss, now of more than $6.2 billion, stemming from a wrong-way bet on credit derivatives. Buffett has described Dimon’s annual letter to shareholders as a must-read.

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“Obviously, you know, there was a failure of control,” Buffett, 82, said to Rose about the trading loss. “If you run an army, if you run a church, if you run a government, any large institution, people will go off the reservation sometimes.”

Joseph Evangelisti, a JPMorgan spokesman, declined to comment.