(CNN) Massachusetts Sen. Elizabeth Warren has been invited to be the marquee speaker the first night of the Democratic convention, according to two people familiar with the scheduling.
Warren -- who is being vetted by Hillary Clinton as a potential running mate -- has proven to be an effective attack dog against presumptive Republican nominee Donald Trump, as well as a liberal firebrand that generates excitement on the left.
The Monday night speaking spot, while prime-time, would not be when a running mate would go, however. But that still doesn't mean a vice presidential pick has been made, the sources said. The convention schedule is operating on a completely separate track than VP talks, so she could easily be swapped with someone else.
Then-Sen. John Edwards was initially announced as a convention speaker in 2004, but then his timeslot changed after John Kerry tapped him as his running mate.
There is an unusually large contingent of people who need time slots in addition to Warren: Vermont Sen. Bernie Sanders, President Barack Obama, Vice President Joe Biden, former President Bill Clinton and the VP pick -- and potentially more.
The campaign and convention teams are trying to sort through who will get the short straw -- Bill Clinton is most likely to, sources said.