IOWA CITY, Iowa — Elizabeth Warren has come up on the short end of her disagreement with 2020 Democratic rival Bernie Sanders, deflating the Massachusetts senator’s presidential campaign at the most inopportune moment.

The attacks between the two furthest-left major Democratic candidates started last week, when Warren, 70, said she was “disappointed” to hear about a leaked memo that instructed Sanders’s campaign staff to tell Iowa voters that she wasn’t capable of building a broad coalition to win a general election against President Trump. The situation escalated when Warren’s team, in return, leaked a story to CNN the night before a Democratic debate alleging that Sanders, 78, told her a woman couldn’t win the White House.