Former President Donald Trump is more than just caught off guard and worried about the prospect of taking on Vice President Kamala Harris in the November election, said his niece Mary Trump in her latest email blast — he’s “jealous” because he “can’t buy what Kamala has.” This comes as Donald Trump delivered his first rally following President Joe Biden’s decision to step down from his campaign, where he vowed that he won’t “be nice” to Harris and whined that the media is paying more attention to her rallies than his. Trump’s “whole campaign strategy” had been geared to attack Biden, wrote Ms….