Presumptive Republican presidential nominee Donald Trump cruised to victory in two more states Tuesday, while Bernie Sanders beat rival Democrat Hillary Clinton in West Virginia, bolstering his case for remaining in the race.
Massive wins in West Virginia and Nebraska put Trump ever closer to clinching the 1,237 delegates he needs to be declared the party's nominee at its convention in July.
"Thank you West Virginia!" and "Thank you Nebraska!" he said in a pair of tweets.
Now the sole Republican candidate in the contest after his remaining rivals dropped out last week, Trump is transitioning from the fierce primary battles with the likes of Ted Cruz and Marco Rubio to a general election showdown with Clinton, even amid deep Republican discord about the celebrity billionaire.
He has narrowed his picks for running mate, telling Fox News he is considering five vice president options.
"I think they are excellent," he added. "I'll announce whoever it will be at the convention" in Cleveland, Ohio, Trump said.
With Republican concern about their nominee sizzling, a Quinnipiac University poll out Tuesday showed Trump closing in on Clinton's lead in two major battleground states -- Florida and Pennsylvania -- and overtaking her in swing state Ohio.
No candidate has won the presidential election without taking at least two of those three states.
Senate Majority Leader Mitch McConnell seized on the polls, telling reporters, "the early indications are that our nominee is likely to be very competitive."
Despite Clinton's overwhelming delegate lead, Sanders ensured the race would go on with his win in West Virginia, where he won more than 51 percent to Clinton's 36 percent with more than 95 percent of the vote counted.
With eight contests remaining, "we think we have a good chance to win many of those states," Sanders told supporters Tuesday in San Francisco, according to CBS News.
"We now have won primaries and caucuses in 19 states," Sanders was reported as saying at another rally in Oregon. "Let me be as clear as I can be: We are in this campaign to win the Democratic nomination."
Quinnipiac's poll also found that Sanders, a democratic socialist who commands an enthusiastic following on the left, would do better against Trump than Clinton in all three states if he were the Democratic nominee.
The 74-year-old Vermont senator, who defeated Clinton in Indiana, has mounted an unyielding come-from-behind challenge that has exposed weaknesses in the former secretary of state's campaign.
Although almost certain to win the Democratic nomination -- she is only about 160 delegates short of that goal -- Clinton's ability to excite young and white working-class Democrats going into the general election has been put in doubt by Sanders's primary successes.
But she has used her campaign stops in Appalachia -- including an event in Kentucky, which holds its Democratic primary on May 17 -- as opportunities to win over blue-collar white voters.
However, in coal-mining West Virginia, Clinton shot herself in the foot in March by telling voters in neighboring Ohio she would slash mining jobs and put coal companies "out of business."
She later apologized and suggested her remarks were misunderstood, but in a state where livelihoods have hinged on coal for generations, many are unconvinced.
While Clinton still has Sanders to worry about, Trump faces a rebellion within the Republican leadership over the insulting tone and shifting substance of his candidacy.
House Speaker Paul Ryan last week announced he was "not ready" to support Trump, a rare rebuke that put the power struggles within the Republican Party on very public display.
Ryan and other Republican congressional leaders were due to huddle with Trump Thursday in Washington in highly anticipated meetings that could help gauge GOP support for the real estate tycoon.
Trump appeared to offer an olive branch late on Tuesday, saying he wants Ryan to remain chairman of the Cleveland convention.
"I'd love frankly for him to stay and be chairman," he told Fox News.
McConnell said he expected "a cordial meeting to discuss the way forward."
It may be thorny, however. Although a defeated Cruz ruled out a third-party bid, when pressed by reporters as he returned to the US Senate he declined to say whether he would endorse Trump.
Rubio said he would "support the Republican nominee" but not offer an outright endorsement.
The Republican establishment is still reeling from Trump's hostile takeover of the party, aghast at positions he's taken on trade, foreign policy and taxes that fly in the face of conservative dictums.
But Trump has shown no sign of backing down as some Republicans are looking to heal, embrace the nominee and turn to defeating Clinton in November.
"I think the party needs to come together," said Senator John McCain, the 2008 Republican nominee.