In August 2015, when Joe Biden was considering a bid for the White House, he invited Elizabeth Warren for lunch at the vice-presidential residence on the grounds of the Naval Observatory in Washington, D.C. According to a person who was briefed about the meeting, Biden told Warren he wanted her to be on his ticket if he ran for president.

He should repeat the offer, right now. Indeed, tapping Warren for vice-president might be just the ticket to unite Democrats and unseat President Trump in November.

It would also prevent a repeat of their debacle in 2016, when Democrats’ internal divisions essentially gifted the presidency to Trump. After a bitter battle against Bernie Sanders in the primaries, Hillary Clinton was never able to rally his supporters to her side. Twelve percent of people who voted for Sanders in the 2016 primaries cast their ballot for Trump, while too many others chose a third-party candidate or simply stayed home.