I hear his own campaign making excuses. No one in other aspects of life would allow their financial advisor, accountant, coworkers, explain away terrible numbers with these falling numbers.
Harris is getting bump with ignorant voters because of all the positive media coverage she's getting. That works with some ignorant, "registered" voters that the polls are including. But, it won't work with informed voters and nor will Harris hold up when Trump and his PACs start hammering her.
Taking polls of registered voters ALWAYS biases a poll in favor of Democrats, especially in year when the incumbent Democrat administration is so unpopular.
Stop panicking and lashing out at Trump.
The bigger concern is that Harris could remain close enough for voter fraud to make the difference again.