As the national debate over gun control raged online after the mass shooting at Umpqua Community College on Thursday, comments on the subject posted on Facebook by Sheriff John Hanlin of Douglas County, whose force responded to the latest rampage, came under scrutiny.

The sheriff, who has made no secret of his strident opposition to tougher gun laws, made his views clear in a letter to Vice President Joseph R. Biden Jr. posted on his department’s Facebook page on Jan. 16, 2013, after the massacre at Sandy Hook Elementary School. Mr. Hanlin urged the vice president to treat his letter as “a formal request that you NOT tamper with or attempt to amend” the Second Amendment.

“Gun control is NOT the answer to preventing heinous crimes like school shootings,” he wrote, adding that efforts to restrict gun ownership “would be irresponsible and an indisputable insult to the American people.”

The sheriff also warned the vice president that “any federal regulation enacted by Congress or by executive order of the president offending the constitutional rights of my citizens shall not be enforced by me or by my deputies, nor will I permit the enforcement of any unconstitutional regulations or orders by federal officers within the borders of Douglas County Oregon.”