Trump counselor Kellyanne Conway also faced tough questioning on "Fox & Friends," the morning show known to be one of Trump's favorites.
Trump, who has forged closer ties with Saudi Arabia and the 33-year-old Crown Prince Mohammed bin Salman, acknowledged for the first time on Thursday that Khashoggi, a US resident and Washington Post columnist, had likely been killed.
Trump Jr said initially the meeting was about adoptions, but said later that Veselnitskaya had promised damaging information about his father's election campaign opponent, Democrat Hillary Clinton.
Trump and Kim met for the second day at the Hotel Metropole in Hanoi.
Trump made the announcement after speaking with Wisconsin Governor Tony Evers, who a day earlier announced he was authorizing increased National Guard support for the county to 250 members.
Trump's opposition to all these international institutions and agreements is "outrageous for Europeans like Merkel and Macron who have multilateralism in their DNA," the article quoted William Drozdiak, a senior fellow at the Washington-based Brookings Institution, as saying.
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Tributes have poured in for Macao casino patriarch Stanley Ho Hung-sun, who died in Hong Kong on Tuesday at the age of 98.
Trump also said he isn't planning a nationwide curfew, despite earlier reports that the administration may implement it.
Trump made the comments after US Attorney General William Barr earlier vowed to carry on the Epstein investigation even after the financier's death and ordered the Justice Department's inspector general to look into the matter.
Trump said Tuesday that he would put his own money into his reelection campaign if necessary, though downplaying the need for it currently.