Kamala Harris and Donald Trump take their nail-biting White House race west, seeking supremacy on border security and aiming to woo crucial Latino voters days ahead of the US election, AFP reports.

Pop singer Jennifer Lopez will bring her star power to the stage for Harris in Las Vegas, as the candidates battle through the seven swing states expected to decide the next president.

Meanwhile, Trump has scheduled an interview in Arizona with ex-Fox News host Tucker Carlson and a rally in Nevada.

Both campaigns have been sidetracked in recent days after controversies stemming from a remark by a warm-up speaker at a Trump rally, which initially blew back against Republicans before a damaging gaffe from President Joe Biden.

Harris made political hay from the comedian calling the US territory of Puerto Rico a “floating island of garbage,” winning the backing of Puerto Rican celebrity Lopez, rapper Bad Bunny and singer Ricky Martin.

But she then found herself on the defensive after Biden appeared to call Trump supporters “garbage” — prompting the Democratic candidate to state that she disagreed with criticism of people based on who they vote for.

Trump, who himself has branded Harris’s allies “garbage” at a public rally, was quick to pounce on the misstep with a publicity stunt as he climbed into a garbage truck at an airport in Wisconsin.

The 78-year-old will also visit New Mexico on Thursday — a surprising call since polls suggest that the state will go to Harris by a comfortable margin.