Fiorina endorsed the Texas senator last month, after abandoning her own White House bid in February. At the time, she described Cruz as "a fearless fighter for our constitutional rights" and a "strong, inspirational" leader.
On the face of it, the two seem unlikely allies — Fiorina's a pro-business conservative (who ran to the right during in the primary), while Cruz is known for his unwavering support of the Constitution and the Bible.
Both, though, have clashed with Republican front-runner Donald Trump.
Leaking the names of potential running-mates is a time-honored political strategy to show continued momentum; this time as Cruz is likely to endure defeats Tuesday in Republican primaries in the Northeast.
The move also creates a fresh narrative for the Cruz campaign — he's not giving up! — as the candidate seeks to win over primary voters in California. It also empowers Fiorina as a surrogate for the candidate.
Fiorina will take the stage Saturday at the California Republican State convention in Burlingame, where she's expected to promote Cruz's candidacy.