President Trump lobbed personal and derogatory attacks at two Democratic senators, mocked the #MeToo movement and vouched for President Vladimir V. Putin of Russia on Thursday during a freewheeling, raucous rally ostensibly intended to solidify support for Montana’s Republican Senate candidate.
Taunting Senator Elizabeth Warren, Democrat of Massachusetts, with a refusal to apologize for calling her “Pocahontas,” Mr. Trump imagined a debate during which he would gently throw an ancestry testing kit at Ms. Warren to make her prove the Native American heritage she has controversially claimed.