Massachusetts Sen. Elizabeth Warren and U.S. Secretary of Housing and Urban Development Julian Castro each met with Hillary Clinton today at her home in Washington, according to sources familiar with the meetings.

The get-togethers were part of a series of meetings the presumptive Democratic nominee held on Friday to discuss the selection of her potential running mate. She is expected to make an announcement sometime next week.



Mike Pence Accepts Donald Trump's Offer for Vice President Spot



Mike Pence: Everything You Need to Know



Warren and Castro are both being vetted by the campaign for the spot.

According to sources, Clinton has not yet selected her running mate; however, she is closing in on making that decision.

Virginia Sen. Tim Kaine, who campaigned with Clinton on Thursday, is also being vetted, and is considered a leading contender for the position.

His office told ABC News he was not invited, nor was he planning, to meet with Clinton today.

ABC News' Ali Rogin contributed to this report.