Trump has zeroed in on Biden as a potential threat to his reelection chances and is testing themes to beat him back. Biden, meanwhile, is campaigning as a front-runner, relishing the one-on-one fight with Trump while making sure he doesn't ignore the demands of the Democratic primary.
Trickle charging is also expected to increase battery safety.
Trump responded: "Don't tell anybody but let me wait until a little bit after the election. I appreciate the advice."
Trump has pledged to boost GDP growth to annual rates of 3 percent or better, but many economists see GDP slowing sharply after hitting 2.9 percent last year.
Trump said he appreciated Kim "doing this and allowing them to go" and he planned to greet the three at the Joint Base Andrews outside Washington early Thursday.
Trump had previously threatened the DPRK with "fire and fury like the world has never seen".
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Trump tweeted after the announcement: "Wow! Big VICTORY on the Wall. The United States Supreme Court overturns lower court injunction, allows Southern Border Wall to proceed. Big WIN for Border Security and the Rule of Law!"
Trump's letter came a day after Pelosi wrote to the president suggesting he postpone his Jan 29 State of the Union address "given the security concerns and unless government reopens this week", amid a stalemate that has shuttered large parts of the federal government since Dec 22, the longest closure in US history.
Trump has said he wants Barrett in place if the election results are fought up to the high court, as in 2000.
Trump has claimed the economy could go "up like a rocket if we did some lowering of rates, like one point." On Friday, Trump tweeted, "Great Consumer Price Index just out. Really good, very low inflation! We have a great chance to 'really rock!' Good numbers all around."