PROVIDENCE, R.I. (AP) — Former Rhode Island Secretary of State Matt Brown has filed to run for governor.

WPRI-TV reports the 48-year-old Brown filed paperwork Tuesday with the Board of Elections.

He says on his website, www.mattbrownforgovernor.com , that he is exploring a run as an independent.

Brown was a Democrat when he was elected to a single term in 2002.

He ran in the Democratic primary for U.S. Senate in 2006 against Sheldon Whitehouse, and largely disappeared from politics after he bowed out of the race.

He has been active with the anti-nuclear weapons group he co-founded called Global Zero.

At least three Republicans have announced challenges to Democratic Gov. Gina Raimondo, including former jewelry company CEO Giovanni Feroce (feh-ROH'-chee), Cranston Mayor Allan Fung and House Minority Leader Patricia Morgan.

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Information from: WPRI-TV, http://www.wpri.com