But Trump earlier in the day appeared to distance himself from the fate of House Republican candidates.
They also could force Trump to scale back his legislative ambitions, possibly dooming his promises to fund a border wall with Mexico, pass a second major tax-cut package or carry out his hardline policies on trade.
Recognizing that the concern about pre-existing conditions has galvanized voters regardless of party, Republicans have seized on it in the campaign's closing month, insisting that their plans would enshrine such protections.
With results still coming in, Republicans had a chance to increase their majority in the Senate. Moscow denies meddling and Trump denies any collusion.
At times on Sunday, it nearly felt like Trump was running a campaign against the man whom he has defined himself against, his predecessor in the Oval Office, Barack Obama.
In fact, 10 of those races are taking place in states President Trump won in 2016, and Republicans are expecting to take several of those seats away from Democrats in states like North Dakota and Missouri.
Before heading to Missouri, Trump will also visit IN to campaign for Republican Senate candidate Mike Braun, who is locked IN a dead heat against Democratic Sen. This happened in 2012, when Democrats in House races received almost 1.5 million more votes than Republicans, with the Republicans nonetheless winning a majority of the seats (by a margin of 234-201).
He said the nation will find out whether the huge early voting has been "made up of people just so ticked off that Trump won, ticked off that they haven't been able to get rid of Trump, ticked off that we have not officially sanctioned ourselves as socialists".
The thousands packing his midterm rallies in the immediate aftermath of the shocking crimes clamored for Mr. Trump's trademark attacks on political foes.
On Monday, RealClearPolitics' "Battle for the House 2018" page gave Democrats a slight lead over the GOP, 202 to 194, with 39 toss-up races. But even then, they're not foolproof, especially at describing who voted.
Lion Air: Crashed Indonesian plane's black box found
The crash is the worst airline disaster in Indonesia since 1997, when 234 people died in the crash of a Garuda flight near Medan. Transport officials do not yet know whether the retrieved device is the flight data recorder or cockpit voice recorder.
Novak Djokovic marks return to world number one with Paris win
Djokovic faces Damir Dzumhur in the third round, the first time they have played each other. " Roger (Federer ) is in the race". Fourth-seeded German Alexander Zverev booked his place in the next round with a 6-4 6-4 win over Frances Tiafoe.
Turkey confirms Khashoggi was strangled, dismembered immediately after entering Saudi Consulate
The murder of the journalist Jamal Khashoggi could not be made without the approval of senior officials of Saudi Arabia. Saudi Arabia has arrested 18 suspects, who, it says, will be prosecuted in Saudi Arabia.
Some of the biggest Democratic stars of the campaign season were struggling.
Democrats needed to pick up two dozen seats to seize the House majority and two seats to control the Senate.
Florida's Senate race pits the long-time incumbent, Democrat Bill Nelson, against the state's outgoing governor, Republican Rick Scott.
"In stark contrast to the GOP Congress", Pelosi said, "a Democratic Congress will be led with transparency and openness".
In Congress, Americans will elect all 435 members of the House of Representatives and 35 of the 100 Senate seats.
Voting rights advocates told The Washington Post that these remarks were attempts to intimidate voters ahead of the elections. "Today, we say enough".
Midterm elections in the U.S. generally garner far less attention than the presidential ones, but this year, not surprisingly, the situation is different as there is a lot at stake for both parties. About 40 million early votes were likely to be cast, said Michael McDonald, a professor at the University of Florida who tracks the figures. The reforms signed into law by Democratic president Barack Obama have helped millions of Americans gain insurance. "I feel to a certain extent I have no choice, but maybe I do", Trump said. If they do that, they'll be able to more effectively block Trump's agenda and try to implement their own.
The Democratic Legislative Campaign Committee and Republican State Leadership Committee, which focus on state races, also set record fundraising targets.
A debate about whether Trump's inflammatory rhetoric encouraged extremists erupted in the campaign's final weeks after pipe bombs were mailed to his top political rivals allegedly by a Trump supporter who was arrested and charged, and 11 people were killed in a shooting at a Pittsburgh synagogue.
Control of the state Senate could be the most important issue decided on Election Day. "I tend to think the arc of the universe bends toward justice, so I don't become discouraged".
"I used to be a moderate fiscal conservative and a social moderate, but I didn't like the way the whole Kavanaugh thing went down - I thought it was dirty", said one woman, a yoga mat slung over her shoulder, as she rushed to her class.