(CNN) Democratic presidential candidate Beto O'Rourke is in discussions with veteran Democratic strategist Jen O'Malley Dillon to become his campaign manager, a source familiar with the discussions told CNN.

O'Rourke told reporters in Milwaukee on Sunday that he is "in talks" with someone to become his campaign manager and has offered the job to one person. He did not say who that person is.

O'Rourke's campaign declined to comment, and O'Malley Dillon did not return requests for comment.

O'Rourke and O'Malley Dillon met at South by Southwest to discuss the role last Saturday, aides tell CNN, and they talked about the possibility of her joining the campaign in a subsequent call. She remains uncertain about the role, a source said, but is likely to decide this week.

It is unusual for a high-profile campaign like O'Rourke's to launch without a campaign manager. He has met with several people, aides said, but has yet to be successful in hiring someone to lead the campaign efforts from its headquarters in El Paso, Texas.

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