TULSA, Okla. (AP) — The group U.S. Term Limits is criticizing Oklahoma Republican Rep. Markwayne Mullin for breaking a pledge to serve only three terms in the House.

Mullin announced in a video last week that he'll run for a fourth term in 2018. He said he "didn't understand politics" when he pledged to only serve three terms.

U.S. Term Limits said in a statement Monday that Mullin not only is breaking a promise to voters, but also failed to keep a pledge co-sponsor and vote for term limits legislation.

Former Oklahoma Sen. Tom Coburn told Tulsa radio station KFAQ that Mullin's decision is sad...