The Human Relations Committee called on President Obama to suspend some deportations.
The White House senior adviser said cities can lead the way on President Obama's agenda.
The mayor will join the protest in solidarity with Fast for Families.
The congressman's memoir, "Still Dreaming," is due out Oct. 7.
In D.C., the mayor said half of all new business licenses are from immigrants and touted Little Village.
The children called on politicians to keep their families together during a rally Tuesday afternoon.
The Rev. Jose Landaverde announced plans to fast and march for immigration reform.
Supporters say it will make state's roads safer; critics worry it opens door for potential fraud.
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