US President Donald Trump has announced in his State of the Union speech that he will hold a second nuclear summit with North Korea's leader this month.
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.
Federal agencies could close again if no spending plan is agreed by the end of next week.
Trump said in his 82-minute speech on Tuesday night that he would meet Kim Jong-un in Vietnam from 27-28 February.
Much work remains to be done, Mr Trump said, but my relationship with Kim Jong-un is a good one.
Plans for a second summit have been in the works since the two leaders' historic talks last year.
Mr Trump and Mr Kim's meeting last June in Singapore was the first ever between a sitting US president and a North Korean leader.
While Pyongyang has not conducted any atomic or ballistic missile tests since last summer, it has yet to agree to dismantle its nuclear weapons programme.
After two years of rancorous partisanship, Mr Trump on Tuesday night repeated calls for political unity that he has made in his last two annual speeches to Congress.
Together, we can break decades of political stalemate, he said. We can bridge old divisions, heal old wounds, build new coalitions.
Mr Trump raised potential areas of agreement, such as infrastructure improvements, lowering prescription drug costs and fighting childhood cancer.
But he added: An economic miracle is taking place in the United States and the only thing that can stop it are foolish wars, politics, or ridiculous partisan investigations.
Democrats have launched a flurry of inquiries into the Trump administration since they took over the US House of Representatives last month.
A special prosecutor is still investigating alleged Russian meddling in the 2016 presidential election and possible collusion between the Trump campaign and Russia, which the president and Moscow deny.
As Mr Trump delivered his nationally televised speech, his chief congressional antagonist was sitting at the rostrum over his shoulder.
The Democratic leader of the House, Speaker Nancy Pelosi, tweeted afterwards: It will take days to fact-check all the misrepresentations that the president made tonight.
Stacey Abrams, who lost her race last year to be governor of Georgia, delivered the Democrats' response to Mr Trump.
She was the first African-American woman to give the party's rebuttal.
Ms Abrams said: The shutdown was a stunt engineered by the president of the United States, one that defied every tenet of fairness and abandoned not just our people � but our values.
She also said that while she is disappointed with Mr Trump, I still don't want him to fail.
Democratic female lawmakers who attended Mr Trump's speech wore white to celebrate the 100th anniversary of American women gaining the right to vote.
They sat stony-faced as their Republican counterparts rose for the applause lines.
But Democrats surprised Mr Trump with a standing ovation when he said there were more women in the workforce and in Congress than ever before.
That's great! said the president, delighted by their reaction. Really great.With another government shutdown deadline impending on 15 February, the president has few options to deliver his signature campaign promise.
Mr Trump told his audience that working-class Americans pay the price for illegal immigration.
Source: Voice of Nigeria