Sanders’ campaign has begun stealthily attacking Warren as a candidate of the upper crust who could not expand the Democratic base in a general election, according to talking points his campaign is using to persuade voters obtained by POLITICO.

The script instructs Sanders volunteers to tell voters leaning toward the Massachusetts senator that the “people who support her are highly-educated, more affluent people who are going to show up and vote Democratic no matter what” and that “[s]he’s bringing no new bases into the Democratic Party.”

“I like Elizabeth Warren. [optional]” the script begins. “In fact, she’s my second choice. But here’s my concern about her.” It then pivots to the criticisms of Warren.