Sen. Tom Coburn (R) announced Monday that he plans to seek re-election next year, putting to rest speculation that the conservative physician who has earned the nickname “Dr. No— for his staunch opposition to earmarks might be ready to leave Capitol Hill after one term in the Senate.

Coburn told those gathered at the Tulsa Press Club on Monday morning that running again was a difficult choice because his work in the Senate keeps him away from his family and his medical practice.

“I also don’t particularly like Washington, D.C.,— he said. But Coburn said he still had work to do to further his goals of limited government.

He reiterated that if he wins a second Senate term, it would be his last. Democrats are not expected to contest the Oklahoma race next year, and Coburn is heavily favored to win another term.

The announcement was quickly hailed by conservative interest groups such as the anti-tax Club for Growth.

Coburn was considered the only potential retirement left for Senate Republicans up for re-election next year. Four are retiring.