In battle to define Harris, Trump hits Democratic coup, ad calls her 'dangerously liberal'

After spending years preparing to run against Joe Biden, Donald Trump faces a unique challenge with 59-year-old vice president Kamala Harris now poised to become her party’s nominee.

It seems more an expression of frustration than anything else. The campaign spent two years preparing to run against Joe Biden, with frailty and mental acuity an overriding issue, and now they’ve got an energetic, 59-year-old vice president who has not been fully defined the way presidential nominees usually are by this point. Howard Kurtz is the host of FOX News Channel's MediaBuzz (Sundays 11 a.m.-12 p.m. ET). Based in Washington, D.C., he joined the network in July 2013 and regularly appears on Special Report with Bret Baier and other programs.

In his interview with Laura Ingraham, Trump said: "They staged a coup against the President of the United States. They went in and they told him, you're leaving. You're way down in the polls, 17 points, I think. It's like you're in a fight with somebody, and you're really winning, and they take him out and they put somebody else in. Nobody ever heard of this before. This is a coup."