Charlie Baker

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Massachusetts Republican Gov. Charlie Baker opens a session called "Curbing The Opioid Epidemic" at the first day of the National Governor's Association meeting Thursday, July 13, 2017, in Providence, R.I. (AP Photo/Stephan Savoia)

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Rhode Island Gov. Gina Raimondo speaks as Massachusetts Republican Gov. Charlie Baker, right, looks on during a session called "Curbing The Opioid Epidemic" at the first day of the National Governor's Association meeting Thursday, July 13, 2017, in Providence, R.I. (AP Photo/Stephan Savoia)

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FILE - In this March 26, 2010 file photo, Christy Mihos smiles as he is introduced prior to facing off against Charlie Baker before their Massachusetts Republican Gubernatorial debate in Hyannis, Mass. Mihos, a former owner of a convenience store chain who twice ran for governor of Massachusetts, died in hospice care on Saturday, March 25, 2017, in Stuart, Fla. He was 67. (AP Photo/Charles Krupa, File)

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Massachusetts Republican Gov. Charlie Baker, left, takes questions from members of the media as Mass. Secretary of Administration and Finance Kristen Lepore, right, looks on during a news conference at the Statehouse, Wednesday, Jan. 25, 2017, in Boston. Baker has filed a $40.5 billion state budget proposal with the Legislature that seeks new controls on Medicaid costs and $179 million in tax changes. (AP Photo/Steven Senne)

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Massachusetts Republican Gov. Charlie Baker, second from top right, faces reporters as Mass. Secretary of Administration and Finance Kristen Lepore, third from top right, and Mass. Lt. Gov. Karyn Polito, top right, look on during a news conference at the Statehouse, Wednesday, Jan. 25, 2017, in Boston. Baker filed a $40.5 billion state budget proposal with the Legislature Wednesday, Jan. 25, 2017 that seeks new controls on Medicaid costs and $179 million in tax changes. (AP Photo/Steven Senne)

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Massachusetts Republican Gov. Charlie Baker, right, faces reporters as Mass. Lt. Gov. Karyn Polito, left, looks on during a news conference at the Statehouse, Wednesday, Jan. 25, 2017, in Boston. Baker filed a $40.5 billion state budget proposal with the Legislature Wednesday, Jan. 25, 2017 that seeks new controls on Medicaid costs and $179 million in tax changes. (AP Photo/Steven Senne)

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Incoming Massachusetts Gov. Charlie Baker invites donations as a Salvation Army holiday bell ringer Thursday, Dec. 18, 2014 in the Downtown Crossing area of Boston. (AP Photo/Stephan Savoia)

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Democrat Martha Coakley, center, pauses as she concedes defeat to Republican Charlie Baker in the Massachusetts governor's race, Wednesday, Nov. 5, 2014, in Somerville, Mass. Sen. Elizabeth Warren, right, looks on. Baker became the state's first Republican governor since Mitt Romney left office in 2007. (AP Photo/Michael Dwyer)

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CORRECTS TO MARK FISHER INSTEAD OF CHARLIE BAKER - Mark Fisher, the Tea Party nominee for governor, greets attendees at the Massachusetts Republican state convention in Boston, Saturday, March 22, 2014. (AP Photo/Stephan Savoia)

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Charlie Baker the frontrunner and favorite in the Republican nomination process for governor picks up the gavel at the Massachusetts Republican state convention after he knocked it off its perch before addressing delegates in Boston, Saturday, March 22, 2014. (AP Photo/Stephan Savoia)

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Charlie Baker, Republican nominee for governor greets attendees at the Massachusetts Republican state convention in Boston, Saturday, March 22, 2014. The delegates are expected to endorse Charlie Baker for governor at Saturday's gathering. (AP Photo/Stephan Savoia)

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Charlie Baker the frontrunner and favorite in the Republican nomination process for governor stands with his wife Lauren as they are bathed in confetti after he addresses attendees, accepting their nomination, at the Massachusetts Republican state convention in Boston, Saturday, March 22, 2014. (AP Photo/Stephan Savoia)