Labor Secretary Hilda Solis is resigning from the Obama administration, the White House announced Wednesday.
"Over the last four years, Secretary Solis has been a critical member of my economic team as we have worked to recover from the worst economic downturn since the Great Depression and strengthen the economy for the middle class," Obama said. "Her efforts have helped train workers for the jobs of the future, protect workers’ health and safety and put millions of Americans back to work."
Solis was a four-term congresswoman representing southern California, and was the first Hispanic woman to serve in the U.S. Cabinet.
Solis becomes the fifth member of the Cabinet to announce that she intends to leave in Obama's second term, joining Secretary of State Hillary ClintonHillary Rodham ClintonViral website imagines US if Clinton had won Brazile: DNC staffers got death threats after email hack Manchin: Sanders backers should challenge me in Dem primary MORE, Secretary of Defense Leon Panetta, Treasury Secretary Timothy Geithner and Environmental Protection Agency Director Lisa Jackson.
Her resignation will likely intensify pressure on the White House to consider diversity in the remainder of its Cabinet appointments. On Wednesday, White House press secretary Jay Carney defended the president's record on diversity, arguing "women are well represented in the president's senior staff here."
"The president believes that diversity is important because having diversity increases the excellence of the pool of advisers around you, pool of the staff that you have here," Carney said. "And I think that's been demonstrated by the — the kinds of — you know, the degree of talent that he has around him now and has had ... around him in the first term. And I think it will be true in the second term."
A White House source confirmed at least one of the women in Obama's Cabinet — Health and Human Services Secretary Kathleen SebeliusKathleen SebeliusObama's health secretary to be first female president of American University Leaked email: Podesta pushed Tom Steyer for Obama’s Cabinet Romney: Trump victory 'very possible' MORE — would be returning for the president's second term. Attorney General Eric HolderEric H. HolderDems fear divisions will persist after DNC chair election Michael Moore touts Ellison for DNC chair: ‘We need fresh blood’ How the candidates for DNC chair stack up ahead of Saturday's vote MORE, an African-American, and Japanese American Secretary of Veterans Affairs Eric ShinsekiEric ShinsekiShulkin confirmed to lead Dept. of Veterans Affairs Dems to Trump: Exclude VA from hiring freeze Dems, GOP battle over pace of Trump confirmations MORE will also be returning.
It's not clear who the White House will look at to replace Solis, but one possibility is Maria Echaveste, the former deputy chief of staff for former President Clinton. The appointment of AFL-CIO executive vice president Arlene Holt Baker could also be considered as a nod to organized labor.
Solis, in a letter to Labor department employees, said she was proud of the administration's effort to reboot the economy and reduce unemployment.
“Because President Obama took very bold action, millions of Americans are back to work. There is still much to do, but we are well on the road to recovery, and middle class Americans know the president is on their side," Solis wrote.
“Together we have achieved extraordinary things and I am so proud of our work on behalf of the nation’s working families. It has been more than an honor to work alongside you in fulfilling the department’s mission. Working with all of you as the nation’s 25th secretary of labor, I have come to learn that the work we do every day is indeed a labor of love."
Richard Trumka, president of the AFL-CIO, credited Solis for bringing "urgently needed change" to the Labor department that put the "government firmly on the side of working families."
Solis "always put the values of working families at the center of everything she did," Trumka said.
— Updated at 6:05 p.m.