"It may not be a blue wave, it's a rainbow wave", he said.
Blue-collar voters and rural America embraced his aggressive talk and stances.
He had some kind words for Pelosi, who with her party capturing the majority of seats Tuesday stands to become the next Speaker of the House.
Everything from Mr Trump's tax returns to discussions from his campaign's inner circle could be targeted.
Record diversity on the ballot may have helped drive turnout.
Also striking was how numerous House races were decided by margins of five points or less.
Representative Adam Smith of Washington state, who is likely to become chairman of the Armed Services Committee, has made it clear one of the first topics he wants the new Democratic-held House to hold hearings on is troop deployments to the Mexican border.
For the most part, Republicans of the 115th Congress handed Trump a "blank cheque". All the while, the Senate is set to continue to methodically confirm Trump's nominees to the courts while holding a check on any Democrat-led legislation in the House.
The results were more mixed deeper into Trump country.
Now with Democrats in control of the House, if Trump's companies or other interests ignore their subpoenas or try legal manoeuvrs to delay or spurn them, they could face a contempt citation to the House floor.
"Tremendous success tonight. Thank you to all!"
With some votes still being counted, Democrats have already surpassed the 218 seats they needed to flip control of the House of Representatives. Republican Ron DeSantis defeated Tallahassee Mayor Andrew Gillum, handing Democrats their third consecutive loss for the Florida governor's mansion.
Some hurt worse than others.
"If that happens, we will do the same thing and government comes to a halt and I'll blame them", Trump told reporters.
"We're looking at that, and I do want to study whatever is being said".
Overall, 6 in 10 voters said the country was headed in the wrong direction, but roughly that same number described the national economy as excellent or good. "It's not just that many of them are women or people of color - many of them are progressives who won their elections demanding Medicare for All [government-backed health insurance], demanding raising the minimum wage to $15 an hour, and making public colleges and universities tuition free".
He said Ms. Love often called him about helping free hostage Joshua Holt, a Utah resident who was released this year after two years in a Venezuelan prison.
The president bet big on a xenophobic closing message, warning of an immigrant "invasion" that promised to spread violent crime and drugs across the nation.
The US and Saudi Arabia have always been key allies, and Trump made the country his first stop overseas as president.
The Democrats picking up governorships in Illinois, Kansas, Maine, Michigan, New Mexico and Wisconsin, but had a heartbreaking loss in battleground Florida. Democrats say that will change nearly immediately when the 116th Congress opens on January 3.
A rough analysis of the races showed 18 Democrats who either were victorious or were leading won their races by five percentage points or fewer. Brown's win occured during a special election in Janurary 2010, some 10 months before the midterm election.
Meanwhile, the close of the 2018 midterm season marked the unofficial opening of the next presidential contest.
They argue that such favours to Trump include Chinese government trademarks for his companies, payments for hotel room stays and event-space rentals by representatives of Saudi Arabia and Kuwait, and proceeds from Chinese or Emirati-linked government purchases of office space in Trump Tower. Cory Booker, California Sen. Among his possible opponents, should he run, are the former vice-president Joe Biden, Sanders' fellow senators Elizabeth Warren, Kamala Harris and Cory Booker, as well as a handful of governors, mayors and business executives.