Lawmakers, party leaders and election prognosticators cautioned Sunday that control of Congress is far from settled heading into Election Day on Tuesday, as Democrats and Republicans sought to make a final pitch to voters.

Early voting numbers are skyrocketing around the country, with Republican votes slightly edging out Democratic ones as of Wednesday, according to NBC. But a pair of polls released Sunday morning showed Democrats with a 7- and 8-point lead on generic ballots.

Changing projections, high voter enthusiasm, and not-too-distant memories of President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE defying polls that showed him trailing late in the 2016 presidential election have party officials and lawmakers urging supporters not to take anything for granted when they weigh how to vote this year.

“No one should be surprised if [Democrats] only win 19 seats. And no one should be surprised if they win 51 seats,” Nate Silver, election forecaster and founder of FiveThirtyEight, said on ABC’s “This Week.”

“Those are both extremely possible based on how accurate polls are in the real world,” he added.

Generic congressional ballot polling has for months given Democrats a sizable edge, leading to predictions of a "blue wave" that the party would ride to control of the House. Democrats must flip 23 seats currently held by Republicans in order to secure a simple majority.

But generic ballot surveys, including those released Sunday, are showing Republicans closing the margins on congressional balloting compared to last month.

Improving numbers, coupled with favorable polls in individual Senate races, have burnished GOP hopes to retain a slim majority in the House and add to their majority in the Senate.

But party leaders are warning voters that nothing is guaranteed in order to keep voter turnout high on election day.

Calling the election "tight," Republican National Committee Chairwoman Ronna Romney McDaniel on Sunday told ABC that "Election Day voting is going to determine the balance of the House."

A CBS News tracker poll released Sunday laid out three potential scenarios for this week's elections. The most likely scenario, the poll found, is that Democrats end up with 225 seats, slightly more than the 218 needed to secure the majority in the House.

That poll has a 13-seat margin of error, however, leaving open the possibility that Republicans could retain a narrow majority if voter turnout breaks their way, said Anthony Salvanto, CBS News's elections & surveys director.

The poll's second most likely scenario sees Republicans minimize their losses in suburban districts, and winning 220 seats to maintain a two-seat majority.

“Democrat enthusiasm is definitely there,” McDaniel said on ABC. “We are seeing that in the early voting, in all of these key House and Senate races and Republicans have been matching."

McDaniel pushed back on the notion that Republicans are resigned to losing control of the House, despite Trump acknowledging it "could happen" during a campaign rally late last week. She cited a strong jobs report released Friday and the state of the economy as strong closing argument for the party.

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Showing more confidence in the upper chamber, one top Senate Republican on Sunday pressed the party's advantage there, while Democrats weren't quite willing to concede defeat.

“We're not only going to hold a majority, I think we're going to add to it,” Sen. Thom Tillis Thomas (Thom) Roland TillisThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting OVERNIGHT ENERGY: EPA head questions connection of climate change to natural disasters | Pebble Mine executives eye future expansion in recorded conversations | EPA questions science linking widely used pesticide to brain damage in children Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight MORE (R-N.C.), the vice chairman of the National Republican Senatorial Committee, said of the upper chamber on "Fox News Sunday."

Tillis highlighted North Dakota, Indiana and Missouri as states where he’s optimistic the GOP can topple Democratic Senate incumbents.

Those are three of 10 races where Democratic senators are running in states that Trump won in 2016. Democrats have 26 senators up for reelection total, compared to nine GOP senators.

The GOP has hammered the economy as its closing argument in most races, warning that a Democratic victory could undo progress made in the last two years under a Republican Congress.

Democratic National Committee Chairman Tom Perez Thomas Edward PerezClinton’s top five vice presidential picks Government social programs: Triumph of hope over evidence Labor’s 'wasteful spending and mismanagement” at Workers’ Comp MORE sought to cast economic gains under the Trump administration as overblown during an appearance on CNN's "State of the Union." Instead, he attempted to shift the focus to health care, which has emerged as the centerpiece of Democrats' closing argument to voters.

"We're focused like a laser on the issues that matter most to people: good jobs that pay a fair wage, health care, and making sure that we have checks and balances in Washington, because this America, in which we have a president who's constantly divisive, that's not the America that my children want," he said.

Sen. Mark Warner Mark Robert WarnerIntelligence chief says Congress will get some in-person election security briefings Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House approves bill to secure internet-connected federal devices against cyber threats MORE (D-Va.), who is not up for reelection this year, delivered a similar closing message on CBS's "Face the Nation." The senator dismissed economic gains under Trump as a "sugar high" from the GOP tax-cut bill passed in December 2017.

While he conceded the economy is in good shape, which has been the GOP's closing argument, Warner argued that voters are more concerned about electing lawmakers who will serve as a check on the president.

"We got a president in Donald Trump that is totally unchecked at this point," Warner said. "And rule of law and frankly America's standing in the world is being undermined."

Sen. Chris Van Hollen Christopher (Chris) Van HollenCongress must finish work on popular conservation bill before time runs out Democrats fear Russia interference could spoil bid to retake Senate Mid-Atlantic states sue EPA over Chesapeake Bay pollution MORE (D-Md.), conceded that his party faces "the toughest political map" in 60 years if it is to retake control of the Senate. He maintained that Democrats still hold a "very narrow path" to pick up the two seats needed to do so, citing opportunities to win races in Arizona, Nevada, Tennessee and Texas.

"We’re prepared for whatever result we have," Van Hollen said on ABC. "But let me just say that the fact that we still have a narrow path to a majority is a sea change from where we were 18 months ago."

As Trump departed the White House on Sunday afternoon for rallies for Georgia gubernatorial candidate Brian Kemp (R) and Tennessee Senate candidate Rep. Marsha Blackburn Marsha BlackburnTaylor Swift on National Voter Registration Day: 'We need everyone' Democrats smell blood with new DHS whistleblower complaint Hillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections MORE (R), he almost exclusively touted his efforts to boost GOP Senate candidates.

The president expressed optimism about Republicans' chances on Tuesday, comparing enthusiasm among voters to that of his 2016 victory.

"I think we’re going to do well in the House, but as you know, my primary focus has been on the Senate and I think we’re going to do really well in the Senate," Trump said.



"There is something going on out there," he added. "The level of fervor, the level of fever is very strong on the Republican side."