Former president Carter and former vice-president Gore have already held high-level discussions about delivering the message that she must stand down for the good of the Democrats.
“They’re in discussions,” a source close to Carter told Scotland on Sunday. “Carter has been talking to Gore. They will act, possibly together, or in sequence.”
An appeal by both men for Democrats to unite behind Clinton’s rival, Barack Obama, would have a powerful effect, and insiders say it is a question of when, rather than if, they act.
Obama has an almost unassailable lead in the battle for nomination delegates, and is closing the gap with Clinton in her last stronghold, Pennsylvania, which votes on April 22.