Trump has sought to link an end to the family separations to passage of a wider bill on immigration, prompting Democrats to accuse him of using children as hostages.
Treatments are to be marketed in the United States once the company receives the required US Food and Drug Administration (FDA) permits.
Trump made unsubstantiated claims that he had won the election and threatened to take his case to the Supreme Court to stop states from continuing to count votes. It was unclear exactly what legal action he might try to pursue.
Trump issued the executive order on Monday, announcing "all property and interests in property of the government of Venezuela that are in the United States... are blocked and may not be transferred, paid, exported, withdrawn, or otherwise dealt with".
Trump's remarks came days after Pyongyang carried out two "important tests" at its Sohae Satellite Launching Ground on Dec 7 and 13.
Trump made in-person campaign appearances throughout the Democrats' convention in swing states, including to Pennsylvania and Biden's hometown of Scranton on the same day Biden accepted the nomination.
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Trump also said that the federal government would fund "100 percent" of the National Guard units called out in New York, California and Washington state.
Trump had tweeted about an hour earlier that, "He won because the Election was rigged!"
Tsang cautioned members of the public to be alert to such attacks, before "any real catastrophe" happens. The veteran officer, with years of experience in criminal investigation, expressed concern over cases in which homemade bombs were found in a secondary school and residential areas, and of police arrests of criminal groups who had been testing explosives.
Trump added that Pompeo, in his secret trip to the northeast Asian country, also spoke with his counterpart in the DPRK.