After eliminating 16 party rivals, warring with much of the Republican establishment and provoking controversy at the party convention, Donald Trump has secured the Party's nomination to run for president.
His son, Donald Trump Jr., announced the support of New York, their home state, during a roll-call vote at the Republican National Convention, ensuring Mr Trump had the majority of delegates - 1,237 - needed to contest the 8 November US presidential election.
With three of Mr Trump's other children at his side, the son said: "It is my honour to be able to throw Donald Trump over the top in the delegate count tonight."
The state-by-state vote to put Mr Trump's name in nomination took place a day after opponents staged a failed attempt to force a vote opposing his candidacy, and after a speech by his wife, Melania, drew accusations of plagiarism.
Senator Jeff Sessions, an early backer of Mr Trump, placed the New York businessman's name in nomination, calling him "a warrior and a winner."
If he follows tradition, Mr Trump will officially accept the nomination on Thursday during his acceptance speech.
Mr Trump's campaign has been marked by frequent controversy over his rhetoric on Muslims, Hispanics, illegal immigration and trade, alarming many in the Republican establishment.
Party officials are hoping to use the convention to smooth out some of his rough edges and present him as a job creator and a strong hand to combat security threats at home and abroad.
Speakers yesterday, the first day of the convention, put the focus on defeating the presumptive Democratic nominee, Hillary Clinton, and taking back the White House after eight years under Democratic President Barack Obama.
The theme of yesterday's convention was "Make America Work Again," and speakers were to take aim at Mr Obama's record on the economy.
Mr Trump, a 70-year-old real estate developer and former reality TV star who has never held elective office, trails Mrs Clinton in many opinion polls after a bruising Republican primary season.
Mrs Clinton was due to be formally nominated at a Democratic convention next week in Philadelphia.
Republicans were due also to place in nomination Indiana Governor Mike Pence, Mr Trump's choice for vice presidential running mate during the four-day convention.
