(CNN) - Add Jeb Bush to Team Rubio.
The popular former Florida governor formally endorsed fellow Republican Marco Rubio's U.S. Senate bid on Wednesday.
"Washington is broken, and Marco Rubio is the only candidate in this race that I trust to help fix it," says Bush, in a statement released by the Rubio campaign.
Bush will team up with Rubio on the campaign trail Friday night at the Pasco County Reagan Day Dinner, according to the Rubio campaign.
The former Florida house speaker, once an underdog in the GOP Senate primary battle, has now all but secured the nomination. Florida Gov. Charlie Crist, the one time front-runner for the Republican nod, was a distant second in recent GOP primary polls. Last week, Crist announced he was dropping out of the primary battle and will run for Senate as a non-party-affiliated candidate.
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Wednesday's endorsement should not come as any surprise as Bush has been increasingly critical of Crist in the past few months.
Following Crist's announcement last week, Bush said he wasn't surprised, adding "This decision is not about policy or principles. It is about what he believes is in his political self-interest."
–CNN Political Producer Peter Hamby contributed to this report.