Vermont’s governor, who supported changes to the state’s gun laws after what he felt was a narrowly averted school shooting, used his credentials as a moderate Republican to urge the nation’s senators to work together to address gun violence. In a letter sent last week to the nation’s 100 senators and released Tuesday to The Associated Press, GOP Gov. Phil Scott said efforts to reduce gun violence can’t just focus on guns. The senators, he wrote, have the chance to work together to make a real difference. Scott wrote the letter, dated June 14, as the Senate worked to finalize the details of a gun violence compromise. The Democats’ lead negotiator said Tuesday that senators are on the brink of an agreement on a bipartisan gun violence bill.