The Trump team — including the president himself — had been focused almost exclusively on Joe Biden to this point. But Warren’s rise now has them thinking she could pose a serious threat in a general election. Warren’s disciplined style, populist-infused speeches, and perceived ability to win over suburban female voters, Trump advisers concede, has raised concerns.

Campaign pollster John McLaughlin has sounded the alarm internally, stressing that Warren’s attacks on Trump threaten to undercut his support from the working-class voters who propelled him to the presidency.

“Although our own early published polls and internal polls discounted Elizabeth Warren, her recent momentum in May and June in national and early caucus and primary states into a strong second place to a flat Joe Biden is a cause for our campaign’s attention,” McLaughlin wrote in a text message to POLITICO.