Every female Democratic senator — minus Elizabeth Warren — attends Clinton endorsement event

There was just one female Democratic senator not on stage with Hillary Clinton during a Washington, D.C., fundraiser and endorsement event Monday: Elizabeth Warren.

The Massachusetts senator signed a letter in 2014 that called on Clinton to run for president, but she has not endorsed anyone in the primary yet, and is one of just six Democratic senators who has not backed Clinton, ABC News reports. Clinton's campaign said all of the senators who endorsed her were invited to the event at the Hyatt Regency, but did not reveal if an invitation had been extended to Warren. "We're honored to have 13 women senators coming together to endorse and support Hillary Clinton," spokeswoman Christina Reynolds said in a statement. "This is a sign of the broad support Clinton is receiving from women across the country who know she'll fight for us."

When asked where Warren was, Maryland Sen. Barbara Mikulski told ABC News she wasn't sure, adding: "Maybe she has a cold." Warren's office did not comment. Clinton, a former senator from New York, had nothing but praise for her former colleagues, telling the crowd the women "have so much courage and smarts, the combination of grit and grace. It was the honor and privilege of my life to serve with them."

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