TAHLEQUAH, Okla. (AP) — An Oklahoma congressman canceled one of several planned town hall meetings in his district, citing safety concerns as his reason for not meeting with voters, who have been venting at Republican officials at such events in recent months.

U.S. Rep. Markwayne Mullin planned a stop Tuesday night at a high school in Tahlequah, about 145 miles northeast of Oklahoma City. But the three-term GOP congressman, who has been shouted down at recent town hall meetings, canceled the event shortly before the start.

In a statement, Mullin mentioned "an escalation of protesters" at recen...