Mr Trump was defiance personified during appearances in New Hampshire and Maine while his campaign worked furiously behind the scene to rebut the claims of at least nine women that he had touched them inappropriately.
He disparaged his accusers, and repeated his claims that there is a vast conspiracy against him to "rig" the election in favour of Hillary Clinton.
He also suggested that Mrs Clinton took a drugs to increase her energy ahead of last week's debate.
"I don't know what's going on with her because at the beginning of the last debate she was all pumped up and at the end it was like, uh... She could barely reach her car," he said, calling for a drug test before the final debate on Wednesday.
He described the stakes of the November 8 election in Manichean terms, warning that America would never recover from a Clinton victory.
"You have 24 days to make every dream you ever dreamed for your children, for your family for your country come true. You have 24 days, and if we don't win as I said before I don't think it's ever going to happen again, our country is going to be in a spiral that won't be stopped," he said.
Mr Trump again raised the accusations of sexual misconduct that have accumulated over the past week.
He once again questioned the account of Jessica Leeds, who claims he groped her "like an octopus" on board an airplane sometime around 1980.
"How about this crazy woman on the airplane. I mean, can anybody believe that one? After fifteen minutes she decided, 'well that was too much.' Fifteen minutes? With the ladies in this place it would be one second and it would be smack," he said to laughter and cheers.
- The Telegraph Reports