Former US president Donald Trump on Sunday told the New York Post he was "supposed to be dead" after surviving an assassination attempt which he described as a "very surreal experience."

"I'm not supposed to be here, I'm supposed to be dead," Trump told the New York Post in an interview aboard his plane en route to Milwaukee for the Republican National Convention where he is set to be confirmed as the party's presidential candidate.

It was a "very surreal experience" he said with a white bandage covering his right ear, the paper said.

Meanwhile, Donald Trump landed in Milwaukee on Sunday for the Republican National Convention, a little more than 24 hours after he was wounded in a failed assassination attempt, according to his son Eric Trump.

"Touchdown in Milwaukee with @realdonaldtrump," Eric Trump posted on social media platform X with a video peering through the cockpit as pilots landed the Republican presidential candidate's plane, dubbed "Trump Force One."

People could be seen disembarking from the plane at the airport in the Wisconsin city.

Trump had insisted he would stick to his schedule for the convention despite Saturday's shooting at a rally in Pennsylvania which left one bystander dead, two wounded, and Trump himself nicked in the ear by what he said was a "whizzing" bullet.

"I cannot allow a 'shooter,' or potential assassin, to force change to scheduling, or anything else," the presumptive Republican presidential nominee said earlier Sunday on Truth Social.

"Therefore, I will be leaving for Milwaukee, as scheduled, at 3:30 P.M. TODAY," he wrote, adding that he opted against delaying his trip to Wisconsin.

Republicans are expected to confirm Trump as their nominee to challenge Democrat incumbent Joe Biden for the White House in November.

Trump is also expected to announce his running mate as early as the opening day on Monday.

He formally accepts the nomination on Thursday in a speech that will be followed by millions, closing the convention by ushering in "a new golden age for America," according to his campaign.