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In an address to the nation with the theme "Choosing Greatness", he vowed once again to build a border wall.
While appealing for political unity, the Republican president also said "ridiculous partisan investigations" could damage US prosperity.
In a rebuttal, Democrats accused Mr Trump of abandoning US values.
His primetime address came less than a fortnight after he backed down to end the longest ever US government shutdown when Democrats refused to fund a US-Mexico border wall.
Fact-checking Trump's speech to Congress
The Pelosi Clap and other curious talking points
Federal agencies could close again if no spending plan is agreed by the end of next week.