"There are, of course, many retirement advisers who put their clients' best interest first, regardless of whether they technically fall under the fiduciary standard. But there is growing concern that investors, many of whom may be retiring soon, will be heavily solicited to roll money out of lower-cost workplace plans and into higher-cost investment products.... There's a lot of pressure on the administration to delay any rulemaking. But Labor Secretary Thomas Perez said it's not a question of if but when."

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