Democrats will use the four nights of their national convention to showcase the past, current and future stars of their party.

President Barack Obama, Vice President Joe Biden, First Lady Michelle Obama, former President Bill Clinton and Vermont Sen. Bernie Sanders are all expected to address delegates gathered in Philadelphia later this month. The schedule also includes Chelsea Clinton, immigrant advocates and the "Mothers of the Movement," women whose children were killed by gun violence and in police shootings.

The event is designed to be a show of party unity and draw a sharp contrast with rival Donald Trump, who has struggled to convince some of the Republican party's biggest names to speak on his behalf at his partyconvention next week.

The GOP's two living presidents, George H.W. Bush and George W. Bush, as well as the party's two most recent presidential nominees, John McCain and Mitt Romney, all plan to avoid the event. Ohio's Republican Gov. John Kasich is also skipping.

Democrats will announce more speakers in the coming days. They say the lineup will include additional politicians, advocates and celebrities.

Massachusetts Sen. Elizabeth Warren and Virginia Sen. Tim Kaine are expected to be on the program. Both are being vetted as potential running mates.

But not all of the party's leaders will be speaking. Breaking with past policy, the White House has forbidden members of Obama's cabinet from addressing the convention. Obama aides fear giving the impression that the president and his team are more focused on politics than governing the country. That takes both Labor Secretary Tom Perez and Housing and Urban Development Secretary Julian Castro — two other potential running mates — off the agenda.

Hillary Clinton is having meetings at her home on Friday about her running mate selection, according to a personal familiar with the meeting. The person spoke on condition of anonymity to discuss internal meetings.

Here's the initial plan for the four-day event:

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MONDAY

Michelle Obama, Sanders and Astrid Silva, a so-called Dreamer who was brought to the U.S. as an undocumented child immigrant, will focus on "putting the future of American families first."

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TUESDAY

Bill Clinton and the "Mothers of the Movement" will highlight Hillary Clinton's work as a young lawyer, first lady and New York senator on behalf of children and families.

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WEDNESDAY

Obama and Biden will address what's at stake in the election and how Clinton has the "experience and steadiness" to continue the work of their administration.

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THURSDAY

Hillary and Chelsea Clinton will call on the country to unify around Clinton's campaign and work together to solve national problems.