“Sen. Bernie Sanders is seeking the support of top labor leaders as he ramps up a campaign for the Labor secretary post in President-elect Joe Biden’s administration.

A longtime senior labor leader told CNN on Tuesday that Sanders has personally called union chiefs asking for their backing, but that his overtures have been met with mixed reactions.

Sanders’ push comes amid intensified jockeying over the powerful Cabinet position from inside the labor movement.

AFL-CIO President Richard Trumka, who is among those Sanders has contacted, favors Boston Mayor Marty Walsh for the job, the senior labor leader said, while Michigan Rep. Andy Levin, a Democrat who is a popular progressive, has also built a base of support among union leadership, including the Communications Workers of America.

The divisions within labor, many of them rooted in climate policy, were subdued during the general election campaign as leaders considered their options and kept a united front in their broad opposition to President Donald Trump.

Sanders’ interest in the position was first reported by Politico in October and, on Tuesday, In These Times magazine also reported that the Vermont senator was seeking out support from potential allies.

A Sanders spokesman did not respond to request for comment on the senator’s outreach. The Biden transition team was not immediately available to weigh in and an AFL-CIO official did not immediately respond to reporting that Trumka was marshaling support for Walsh.” For the rest of the story, visit CNN here.