Trump said he and his campaign has started to shortlist and compile "potential vice presidential" running mates which would include some of his former rivals in the Republican presidential primaries -- Ben Carson and Chris Christie.
Republican presidential candidate John Kasich is withdrawing from the race to the White House, a media report said on Wednesday.
Five states will go to the polls including Florida, Illinois, Missouri, North Carolina and Ohio as well as the Northern Mariana Islands.
Republican presidential front-runner Donald Trump on Sunday suffered a double blow as he lost badly to rivals Ted Cruz and Marco Rubio in polls in the US capital and Wyoming, an indication that the fight for securing the party's nomination was hotting up.
The 69-year-old billionaire reality TV star has now won three of the four early nominating states, after convincing wins in South Carolina and New Hampshire.
The four candidates are billionaire real estate magnet Donald Trump; two first term Senators Ted Cruz from Texas and Marco Rubio from Florida and the Ohio Governor John Kasich.
Following their abysmal performance in the Iowa caucus and New Hampshire primary, New Jersey Governor Chris Christie and former corporate honcho Carly Fiorina have ended their campaigns to seek the Republican US presidential nomination.
Hillary Clinton, Donald Trump and John Kasich scored major victories on Tuesday that significantly reshaped the presidential race while a big loss in Florida prompted Marco Rubio to drop his White House bid.
Here are seven of the buzziest moments from the GOP's big night.
Trump's victories came in Maryland, Connecticut, Delaware, Pennsylvania and Rhode Island, while Democratic front-runner Hillary Clinton won in Connecticut, Delaware, Maryland and Pennsylvania
He hoped that the candidate 'advances the principles of our party and appeals to a wide, vast majority of Americans'.
Republican presidential front-runner Donald Trump has said the US has now become a "third world country" as compared to infrastructures in Dubai and China, and promised that things would change once he is elected the American president.
Facing no active opposition, Donald Trump on Wednesday cruised to victory in the Washington state primary and was just one step away from clinching the Republican presidential nomination to set up a likely clash with Hillary Clinton in the November polls.
England's Amir Khan sparked loud roars of laughter ahead of his WBC middleweight title fight with Mexican Saul 'Canelo' Alvarez on Saturday when he aimed a light-hearted verbal jab at Republican presidential candidate Donald Trump.
A win for Trump, 69, as latest polls indicate, could very well bring the billionaire real estate magnate very closer to the magical figure of 1,237 delegates needed the win the party's presidential nomination for the November 8 election.
If elected, he would be the first successful businessman without any political experience to become the US president.
Terror shook the world for the second time in less than a week on Sunday, with a suicide bombing that killed at least 65 at a park in Lahore.
'The opinion of this so-called judge, which essentially takes law-enforcement away from our country, is ridiculous and will be overturned!' Trump said in a tweet.
Clinton's defeat in Michigan is an indication of the challenges she might face in the rest of her presidential campaign.
Terming China as "number-one abuser", leading Republican presidential candidate Donald Trump has alleged that the Communist nation, along with India, is taking advantage of the US through its economic policies.
At the black-tie event, Obama satirised everyone from Democrats to Republicans and from media to his potential White House successors, including Hillary Clinton.
Donald Trump's own party leaders came out openly against the Republican presidential nominee.
Donald Trump virtually sealed his Republican nomination for the United States presidential polls on Tuesday night after he scored a major win at the Indiana primary and his nearest rival Texas Senator Ted Cruz bowed out of the race.
A total of 12 states from Alabama to Alaska are holding primaries or caucuses today. Virginia was the first state to open its polling stations at 6:00 am (16:30 IST).
After three consecutive abysmal performances in Iowa, New Hampshire and finally in South Carolina, the third presidential aspirant from the Bush family announced to suspend his campaign.
The two leaders said they are "totally committed to working together" and called for "shared principles" and a "conservative agenda".
Republican Donald Trump and Democrat Hillary Clinton on Wednesday knocked down another barrier by winning in Arizona presidential primaries but the frontrunners lost out in Utah to their nearest party rivals who kept their chances alive as the race to the White House gathered steam.
US Republican front runner Donald Trump on Thursday came under a brutal attack from party's former presidential nominee Mitt Romney who called him "phony and a fraud".
Republican Donald Trump and Democrat Bernie Sanders cruised to early victories in the New Hampshire primary.
The Vermont Senator and Texas senator are closing in on the lead that their competitors - Clinton and Trump hold.
Delivering his victory speech, Trump told a crowd of cheering supporters that he will focus on bringing the jobs back from 'Mexico and all other countries' and investing in America's military and its veterans.
Louisiana Governor Piyush 'Bobby' Jindal may not have been among the top 10 Republican presidential hopefuls at the first GOP primary debate in Cleveland, Ohio. But he sure did make a strong pitch for his candidature, ripping apart President Barack Obama and forcefully putting across his thoughts on contentious issues like immigration and foreign policy.