Republicans ramp up attacks on Kamala Harris amid swirl over Biden future

Strength of criticism suggests Trump and allies see vice-president as powerful electoral asset for Democrats

With the state of Joe Biden's re-election campaign in turmoil, Donald Trump and his Republican allies are stepping up attacks on a familiar and, some say, possibly more threatening, political foe: his vice-president, Kamala Harris.

In the weeks since Biden's stumbling debate performance, Republicans have intensified what many call racist and misogynistic criticism. They have questioned Harris's competency, mocked her demeanor, and accused her of concealing concerns about the president's health. Trump unveiled a new, derisive nickname for the vice-president, Laffin' Kamala", which he tested at a campaign rally in Florida this week.