Tselikis said some distributors say they might not be able to hold on until the China-US trade dispute is solved.
Trump had once railed against the flow of foreign workers and argued, despite conflicting evidence, that foreigners hurt American workers by competing for jobs and driving down wages. But Trump now says he favors more legal immigration because of economic gains on his watch.
Trump tested positive for COVID-19 on Oct 1 and the coming Saturday would be day 10 since the diagnosis.
Trump told Fox News on Thursday morning that "it's a disgrace" the way his nominees have been treated, including Jackson.
Trump's visit came as new protests were planned in Los Angeles following the fatal shooting by sheriff's deputies of a black man, identified as 29-year-old Dijon Kizzee, after a violent altercation.
Trust, but verify
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Trump is expected to watch the vote play out from aboard Air Force One as he flies to Kansas.
Trump dismissed the Nadler probe and others as futile efforts "in search of a crime." "Ridiculous!" he exclaimed on Twitter.
Trump's former campaign chairman, Paul Manafort, stands accused of repeatedly lying to investigators since his guilty plea last September. Another Trump campaign aide, George Papadopoulos, is serving a 14-day prison sentence and, though he pleaded guilty to the same crime as Flynn, was denied probation because prosecutors said his cooperation is lacking.
Trump, however, came with a different priority: Countering what he has repeatedly described as the "anarchy" in Democratic-led cities.