The Clinton campaign told TPM on Thursday, in response to a query, that the Democratic frontrunner "will have a lot to say" about the issue and emphasized her opposition to privatizing Social Security.

"Hillary has spent a lot of time these last several months looking at bold solutions for our toughest challenges and she's now asking questions and sharing ideas directly with voters. As the campaign ramps up, she will have a lot to say about strengthening retirement security," Jesse Ferguson, a spokesman for Clinton's newly minted campaign, said in an emailed statement. "Hillary has a record of fighting against privatizing Social Security and opposing cuts to seniors benefits and, as she said yesterday, dealing with challenges facing older Americans is a top priority for her."

Two other potential Democratic primary contenders — former Maryland Gov. Martin O'Malley and Vermont Sen. Bernie Sanders — have championed Social Security expansion, which primarily involves providing more generous benefits and paying for them by lifting the income cap on payroll taxes.

Republicans are united against the idea — many of them prefer to trim benefits to avoid letting the Social Security trust fund dip into the red.