Former Florida Gov. Jeb Bush (R) will endorse North Carolina House Speaker Thom Tillis (R) in his crowded Senate race, according to the National Review.

The endorsement is the latest push by the Republican establishment to help Tillis pass the 40 percent threshold needed next Tuesday to win the GOP primary. His opponents for the nomination include Tea Party candidate Greg Brannon (R) and Baptist minister Mark Harris (R).

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Bush's endorsement is the latest sign the former governor is getting more involved in party politics after a long hiatus. He's been looking to back more establishment candidates and causes across the board, and also endorsed the more centrist GOP candidate in California's gubernatorial race this week.

Bush is also seen as a possible 2016 contender and has said he is thinking about a possible presidential run.

Tillis has gotten a ton of establishment support in the race to help him win the primary outright, avoid a runoff and conserve resources for the general election against Sen. Kay HaganKay Ruthven Hagan2020 Dems compete for top campaign operatives Senate GOP rejects Trump’s call to go big on gun legislation Politics is purple in North Carolina MORE (D-N.C.). North Carolina Gov. Pay McCrory (R) endorsed him on Tuesday, and American Crossroads has spent millions airing TV ads on his behalf.