Republican flagbearer, Donald Trump has proposed three September debates against Kamala Harris as he sought to wrest back some of the attention lavished on his rival since her entry into the US presidential election.

The country's first female, Black and South Asian vice president heads into the Democratic National Convention in Chicago later this month on the back of a series of packed rallies that have won plaudits for a positive message that has reenergized the base.

Meanwhile, Trump who addressed journalists at his oceanfront estate in Florida said he has found himself on unfamiliar ground as a bystander, eclipsed by Harris's rise as he scaled back his own campaigning.

Responding to Trump, Harris said she would look forward to facing off on ABC News on September 10, a previously scheduled debate that the two campaigns had sparred over after Trump temporarily backed out.

Reports have it that the former president's debate with a dismally performing Joe Biden in June spelled the end of the veteran Democrat's reelection campaign, as Trump had been reluctant to face Harris on neutral territory. #