Scott Brown warns staff over war whoops 26 (UPI) -- U.S. Sen. Scott Brown, R-Mass., warned his staff against a repeat of anything like the Indian war whoops at a recent rally, his campaign said Wednesday. Under fire from tribal leaders and others for the campaign war whoops and tomahawk chops, Brown said he "regrets" the "unacceptable" behavior by those who took part, including members of his staff. "Senator Brown has spoken to his entire staff -- including the individuals involved in this unacceptable behavior -- and issued them their one and only warning that this type of conduct will not be tolerated," Brown spokeswoman Alleigh Marre said. As we enter the final stretch of this campaign, emotions are running high, and while Senator Brown can't control everyone, he is encouraging both sides to act with respect. He regrets that members of his staff did not live up to the high standards that the people of Massachusetts expect and deserve. Cherokee Nation Principal Chief Bill John Baker says use of American Indian stereotypes by Brown's backers was "downright racist." WCVB-TV, Boston, reported members of Brown's staff joined supporters in using war whoops and tomahawk chops to mock Democratic Senate nominee Elizabeth Warren at a campaign rally Saturday. "The Cherokee Nation is disappointed in and denounces the disrespectful actions of staffers and supporters of Massachusetts Senator Scott Brown," Baker said Wednesday. Baker said a campaign "that would allow and condone such offensive and racist behavior must be called to task for their actions."