Rick Green, a wealthy Massachusetts businessman, has decided against a run for the U.S. Senate against Elizabeth Warren in 2018.

In a Facebook post and multiple tweets posted Monday, Green explained his decision, writing, “With a young family and growing business we’ve decided that my focus should remain on the good work we’re doing at MassFiscal.”

The Pepperell resident had been mulling a run for the seat currently held by Democratic incumbent Elizabeth Warren. Green is known for his work as the chairman of the board of Massachusetts Fiscal Alliance, a non-profit advocacy group with fiscally conservative leanings.  He is also the president of A1 Auto, a local auto parts business located in Westford, Massachusetts.  

With a young family and growing business we’ve decided that my focus should remain on the good work we’re doing at @MassFiscal. #mapoli

— Rick Green (@RickGreenMA) March 13, 2017

Green had some advice for Republicans who are considering a challenge to Warren: Get behind one candidate early.

“I support primaries in general, but in this particular race you’re climbing such a steep hill, it’s good to have that conversation early and reach a conclusion sooner rather than later,” Green told Massachusetts’ State House News Service in Lowell. “We might be better served to rally and unite behind one candidate sooner that later because the general is going to be so tough.”

Other potential candidates for Warren’s seat are John Kingston, a wealthy businessman from Winchester, and Massachusetts state Rep. Geoff Diehl.