WASHINGTON — The chairman of the Senate Banking Committee said Friday he is asking J.P. Morgan Chase & Co. CEO Jamie Dimon to testify before the panel on June 7.

Sen. Tim Johnson, the South Dakota Democrat who heads the committee, said he wants to ask Dimon about the firm’s $2 billion trading loss.

“I expect Mr. Dimon to come prepared to provide the committee a better understanding of this massive trading loss so we can take the implications into account as we continue to conduct our robust oversight over the full implementation of Wall Street reform,” Johnson said in a statement.

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