The Commerce Department will first allow for public comments on the investigation to be submitted no later than 21 days from Wednesday.
However, on Sunday, Trump reportedly said he will be announcing new tariff rates on imported semiconductors over the next week, and that flexibility will be shown to certain companies.
On the same day, Commerce Secretary Howard Lutnick told ABC News' "This Week" that separate tariffs for semiconductors and electronic products were coming in "probably a month or two."
Trump's Commerce Department cited the probe under Section 232 of the Trade Expansion Act of 1962, which can permit the U.S. president to impose tariffs on the grounds of national security.