Donald Trump launched fresh personal attacks against White House rival Kamala Harris on Saturday, as new polling showed her making major gains in key battleground states ahead of next week’s Democratic National Convention. Speaking at a rally in Pennsylvania, Trump began by blaming Vice President Harris for unleashing “devastating” inflation – one of the biggest issues of the campaign – but he soon drifted off script, mocking Harris’s laugh and calling her a “communist” and a “lunatic.” At one point, criticising a portrait of Harris on the cover of Time magazine, Trump insisted he was “much be…