A senior adviser to Donald Trump said Tuesday that while he sympathized with what Vice President Kamala Harris is “going through,” he was disappointed that her concession speech didn’t include a pledge to work with the president-elect to achieve his “mandate for change.” “This is a tough speech to give, I mean I can definitely feel for Kamala Harris and what she’s going through,” Jason Miller said on Fox News shortly after Harris delivered a powerful concession speech in Washington, D.C. The longtime Trump adviser confirmed Harris and Trump had a “very positive conversation” earlier in the day…