Harris and Trump spar over stamina as the they woo Michigan

She doubts his fitness while he points to his energy as they campaign in battleground state

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Democrat Kamala Harris raised questions about Republican Donald Trump's physical stamina to serve effectively as US president as the rivals tore through the deadlocked battleground state of Michigan on Oct 18, with Trump lashing back about the energy he has shown on the campaign trail.

Ms Harris, who turns 60 on Oct 20, pressed the case to raise doubts about the 78-year-old Trump. Age had been an issue when US President Joe Biden, 81, was still in the race, but faded after he dropped his election bid.

On Oct 18, Ms Harris said news reports that former US president Trump was skipping interviews because he was tired, and had passed on the chance of a second debate with her, raised questions about his fitness for office.

"It should be a concern. If he can't handle the rigours of the campaign trail, is he fit to do the job?" Ms Harris, the US Vice-President, told reporters before a rally in Grand Rapids. "That's a legitimate question." Trump has skipped some appearances, but his campaign has not provided reasons.

Trump, talking to reporters as he arrived in Detroit, rejected such talk. "I've gone 48 days now without a rest," he said.