Donald Trump is facing words of caution from within his party as the presumptive Republican presidential nominee narrows down his choice for vice president.

With former GOP presidential rival Nikki Haley continuing to chip away at his primary victory margins despite dropping out of the race two months ago, some Republicans are sounding the alarm for Trump to give more consideration to a vice presidential pick who can help close the gap with irritated supporters of the ex-South Carolina governor.

There were further warning signs for Donald Trump in the Indiana GOP primary as Nikki Haley received more than 20 percent of the vote despite dropping out of the race two months ago.

Trump, the presumptive 2024 Republican candidate, easily won the race on Tuesday with 78.3 percent of the vote, continuing his dominance overall in the GOP primary, but the former South Carolina governor still received 21.7 percent in Indiana, which amounted to more than 128,000 votes.

Outside political advocacy groups spent $85.2 million supporting Nikki Haley’s presidential campaign, leading to the former South Carolina governor securing merely 89 of the 2,429 available Republican primary delegates before her withdrawal on Wednesday — a total cost of over $957,300 per delegate.

These columns were skeptical of Nikki Haley’s rationale when she announced her candidacy for President last year. But she found one along the way, and her campaign did a public service by reminding voters that the Republican Party isn’t a MAGA monolith.

Ms. Haley suspended her campaign on Wednesday after losing in every Super Tuesday primary state other than Vermont. Yet she lasted longer in the race than the other candidates, including Florida Gov. Ron DeSantis, who started with far more money and publicity.

Donald J. Trump’s daunting level of Republican support helped him vanquish a field of presidential primary rivals in under two months.

But he still hasn’t won over one small but crucial group of voters — the men and women who cost him a second term in 2020.

His overwhelming primary victories, including more than a dozen on Tuesday that pushed Nikki Haley from the race, have masked his long-term problems with voters who live in the suburbs, those who view themselves as moderates or independents, and Republicans who backed Joseph R. Biden Jr. in 2020.

With Donald Trump’s victories on Tuesday, he has moved to the cusp of securing the 1,215 delegates necessary to win the Republican Party’s presidential nomination. The rest is a formality. The party has become a vessel for the fulfillment of Mr. Trump’s ambitions, and he will almost certainly be its standard-bearer for a third time.

This is a tragedy for the Republican Party and for the country it purports to serve.

Despite resounding victories on Super Tuesday, there are indications that Donald Trump is still struggling to get strong, united Republican support, which he may need in the presidential election.

Trump is all but certain to clinch the GOP's 2024 presidential nomination, setting up a rematch with President Joe Biden in November, after dominating the busiest day of the primary calendar with easy victories in more than a dozen states on March 5.

HALEY LOSS ANOTHER REMINDER: GOP CAN’T GO BACK. What does Nikki Haley’s loss in the Republican presidential primaries, a loss in which she gathered a substantial amount of votes but was able to win only in Vermont and Washington, D.C., tell us about the Republican Party? Among other things, it tells us, as if we needed another reminder, that the GOP cannot return to the days of leaders like George W. Bush, John McCain, Mitt Romney, and Paul Ryan.

It’s the November rematch few Americans want — except the ones who keep voting for it.

Donald Trump and Joe Biden romped across the Super Tuesday map, easily wiping out their closest challengers and marching to the precipice of their respective nominations.