Hillary Clinton's campaign is vetting retired four-star Adm. James Stavridis, according to The New York Times.
Stavridis led NATO from 2009 to 2013 as the supreme allied commander, and currently dean of Tufts University's Fletcher School. NBC News confirmed he has met with top Clinton vetter attorney James Hamilton.
While the admiral's political affiliation is unclear, he has criticized Donald Trump, writing that the presumptive Republican nominee "would sow the seeds of global instability."
Stavridis could help Clinton in states with large military operations and bolster her national security credibility.
While Trump's candidacy has scrambled traditional political coalitions, it has had a particularly pronounced effect in foreign policy. He has drawn the ire of many of the GOP's foreign policy establishment, while attracting a surprising mix of supporters.
Other potential vice presidential picks for Clinton include top contenders Virginia Sen. Tim Kaine and Massachusetts Sen. Elizabeth Warren.