Watch the Biden-McCain video from the 2020 Democratic National Convention

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Cindy McCain went to bat for Joe Biden, lending her voice to a video that aired during Tuesday night’s Democratic National Convention programming focused on Biden’s close friendship with her late husband, Republican Sen. John McCain of Arizona.

She’s just the latest Republican to join in the convention, after a number of notable GOP former elected officials — including former Ohio Gov. John Kasich — endorsed the presumptive Democratic presidential nominee on Monday night. It’s a continuation of a major theme that Democrats have pushed through the first night of the convention — an effort to broaden the party’s appeal to occasional Republicans and disaffected Trump voters.

Cindy McCain is not expected to offer an explicit endorsement, but her involvement in the video is her biggest public show of support yet for Biden’s candidacy. McCain was the 2008 Republican presidential nominee against Democrat Barack Obama, who won the election with Biden as his vice presidential running mate.

The video on Biden’s friendship with McCain is one of a series of short documentaries created by Oscar Award-winning director Davis Guggenheim, who worked on “An Inconvenient Truth,” the 2006 documentary on climate change that featured former Vice President Al Gore. On Monday night, Guggenheim’s short film focused on Biden’s relationship with the Amtrak conductor and workers on the trains he took from Delaware to Washington as senator aired during the convention.