A surprise DNC guest to speak at the convention... but will they upstage Kamala Harris?

The Democratic National Convention is pulling out all the big stops this year with a stacked line-up of speakers.

President Joe Biden will make remarks on Monday followed by a speech from Hillary Clinton. On Tuesday former President Barack Obama is headline and fellow former Democratic President Bill Clinton on Wednesday.

But another speaker was just revealed to be in the line-up – and some Democrats wanted to see this person replace Biden on the 2024 ticket instead of Vice President Kamala Harris.

Michelle Obama will speak Tuesday before her husband's remarks, the Chicago Sun-Times reported.

It's now revealed that former First Lady Michelle Obama will speak at the Democratic National Convention in Chicago, Illinois on Tuesday

The former first lady is highly popular among Democrats and in surveys taken before Harris became the nominee, Michelle was the only potential replacement for Biden that was beating Donald Trump in the polls last month.

In 2016, the outgoing first lady spoke at the Convention as her husband was leaving office and delivered the now-famous line: 'When they go low, we go high.'

While Democrats were scrambling last month to find a potential replacement for Biden after his embarrassing debate performance against Trump, Michelle emerged as the only challengers that could beat the former president.

While she has never held any elected position, Michelle has promising polling figures, a rare popularity among voters and ability to draw from her husband's political connections. 

A post-debate poll by Ipsos last month showed Harris losing to Trump by 1 percent, but Michelle was ahead of him by commanding 11 percent. 

Some wanted to see Michelle headlining the 2024 ticket instead of Vice President Kamala Harris

A Chicago Police officer takes an image of people posing beside a mural of Harris outside the United Center that was placed in preparation for the DNC this week

More than 50,000 people are descending on Chicago for the Democratic Convention this week – where Harris and Walz are expected to official be nominated for the 2024 ticket. 

After the biggest voices in the Democratic Party speak at the Convention earlier in the week, Minnesota Gov. Tim Walz will accept his nomination as vice president with a speech on Wednesday. 

Harris will finish off the event with her keynote address on Thursday, followed by a balloon drop.

A survey last month revealed that Michelle Obama was the only Democrat polling ahead of Donald Trump in a potential 2024 match-up amid calls for Joe Biden to step down