Han, a 75-year-old career bureaucrat and prime minister under Yoon, was acting president but resigned last week and officially announced his presidential bid.
His approval rating is in the single digits.
Han, who spent around two months as acting leader after Yoon was impeached, said on Wednesday he was “the most experienced and capable person” to discuss trade issues with the US.
While leading the country, he said he had directly spoken to Trump, who he saw as an “amicable” and “proactive” person in “resolving issues with South Korea”.
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