LOS ANGELES, Calif. — Sen. Elizabeth Warren (D-Mass.) will address a key faction of the liberal base Monday as speculation intensifies that she will someday seek the presidency.

Helping to open the quadrennial AFL-CIO convention, Warren is expected to be celebrated by rank-and-file union members as labor’s liberal bulwark in the Senate. The Massachusetts senator can strengthen her bonds with the key Democratic constituency that will play a big part in the party’s 2016 presidential primary.

“The bottom line is, I think the world of her and I think the whole labor movement does. She is a woman of her word and she knows you never lose when you stand up for what’s right,” said Massachusetts AFL-CIO President Steve Tolman.

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“I am not thinking about the presidency right now, but I do know we have the greatest U.S. senator representing us. I want her in the Senate doing the great work that she’s doing,” Tolman said. “Give me a couple more years and let me find out she’s interested, and I will drive the train.”