Vice President BidenJoe BidenMadame Tussauds unveils new Biden and Harris figures US raises concerns about Russian troop movements to Belarus Putin tests a model for invading Ukraine, outwitting Biden's diplomats MORE wrapped up his address to union leaders during a summit at the White House on Wednesday with a joke about being "demoted to secretary of State."

"So we're counting on you, we need your help, we need your suggestions, we need your muscle, we need to move," Biden said in his closing remarks on the importance of organized labor. 

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"And if I don't move, I'll be demoted to secretary of State or something like that," Biden said to laughs as he moved to wrap up his remarks after arriving a few minutes late to the lectern.

"That's a joke," he quickly added, pointing to the press in the room. "That's a joke. That's a joke."

Biden's remark comes as he is expected to decide within days whether he will mount a White House campaign to challenge former Secretary of State Hillary ClintonHillary Diane Rodham ClintonThe Hill's Morning Report - Presented by Facebook - Democrats see victory in a voting rights defeat Left laughs off floated changes to 2024 ticket A year into his presidency, Biden is polling at an all-time low MORE.

Clinton has long been the favorite for the Democratic presidential nomination since before she announced her bid in mid-April, but has faced challenges in some polls recently.

Sen. Bernie Sanders (I-Vt.) has so far been the leading rival to Clinton, closing in on her in some polls in the early voting states of Iowa and New Hampshire while Biden publicly mulls a bid.