Sen. Elizabeth Warren, D-Mass., is calling on the Trump administration to clarify its stance on raising the retirement age.

In a new letter sent to President Donald Trump on Sunday night, Warren cited details from the Social Security Administration's latest trustees report. In late 2032 — just a bit more than six years from now — the trust fund Social Security relies on to pay retirement benefits will run out, according to new projections in the report. At that time, 78% of those benefits will be payable if lawmakers take no action.

"Republicans have a history of attempting to increase the retirement age, privatize Social Security, or otherwise cut Social Security benefits, and some Congressional Republicans have called to raise the retirement age or means-test benefits as the 'solution' to this problem," Warren wrote.

Changes to the Social Security age thresholds would be tantamount to a benefit cut, experts have said.

The White House did not immediately respond to a request for comment on Warren's letter.