There may be one more Clinton on the campaign trail this fall.
Chelsea Clinton has announced that she is expecting a second child next summer.
"Charlotte is going to be a big sister! Feeling very blessed & grateful this holiday season," wrote Clinton on Twitter Monday.
Chelsea Clinton, 35, and her father, former President Bill Clinton, have largely stayed off the campaign trail since Hillary Clinton launched her Democratic primary bid in April.
Both have said they plan to intensify their public political roles after the New Year in an effort to boost Clinton's campaign just six weeks before the first round of primary voting.
In a September interview on NBC's "Today," Chelsea Clinton said her mom was always game for singing "The Wheels on the Bus" to granddaughter Charlotte and was helping her learn to walk.
The younger Clinton is author of the book "It's Your World: Get Informed, Get Inspired & Get Going!" — an illustrated guide for young people looking to become involved in political and social causes.
Chelsea Clinton is married to hedge fund manager Marc Mezvinsky, the son of former U.S. congressman Edward Mezvinsky and former U.S. congresswoman Marjorie Margolies-Mezvinsky.