Trump broke with a decades-old precedent by refusing to release his returns as a presidential candidate in 2016 and continues to do so as president, saying his tax returns are under IRS audit.
Trips from Tianjin to Japan's Okinawa and Miyako islands and those from Beijing to Vietnam and Singapore enjoyed brisk bookings before the holiday.
Trump denies any wrongdoing and has condemned the impeachment inquiry as unfair. His Republican allies in Congress argue that there is no direct evidence of misconduct and that Democrats have conducted an improper process that did not give the president an opportunity to mount his own defense.
Trump has not settled on a replacement for McGahn, White House spokeswoman Sarah Sanders told reporters.
Trump's Democratic predecessor, Barack Obama, was criticized by immigrant groups for deporting scores of non-citizen US military veterans and for deporting immigrants whose only crime was re-entering the country after an earlier removal order.
Trump made the announcement on Twitter. His decisions came as both former nominees, economist Stephen Moore and pizza-chain executive Herman Cain, withdrew themselves from consideration.
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Trump made his request after withholding 1 million in security aid approved by the US Congress to help fight Russian-backed separatists in eastern Ukraine.
Trump's plan, which does not add protections to Deferred Action for Childhood Arrival recipients, is expected to draw little support from Democrats who have railed against the administration's lack of support for so-called "Dreamers," who were brought to the United States as children by undocumented parents.
Trump also believed that he and Kim would be having another meeting, without mentioning the possible date and location.
Trump's defense team argued Friday that the Senate doesn't need to call more witnesses because the case from House Democrats is defective, but that calling witnesses could permanently damage relations between Congress and the presidency.