US Republican Presidential Nominee Donald Trump is shown on a video monitor as he speaks live to the crowd from New York at the Republican National Convention in Cleveland, Ohio, US July 19, 2016.  [Photo/Agencies]

CLEVELAND - After vanquishing 16 party rivals, warring with much of the Republican establishment and provoking controversy at the party convention, Donald Trump on Tuesday secured the party's 2016 nomination for the White House.

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 Trump had the majority of delegates - 1,237 - needed to contest the Nov 8 US presidential election.

With three of Trump's other children at his side, the son said: "It is my honor to be able to throw Donald Trump over the top in the delegate count tonight."

The state-by-state vote to put 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.

US Senator Jeff Sessions of Alabama, an early backer of Trump, placed the New York businessman's name in nomination, calling him "a warrior and a winner." US House of Representatives Speaker Paul Ryan, the country's highest-ranking elected Republican, ran the meeting and launched the nominating process.

Members of Republican US presidential candidate Donald Trump's family, son Donald Trump Jr. (2nd L), daughter Ivanka (C) and son Eric stand with the New York delegation during the nominating process at the Republican National Convention in Cleveland, Ohio, US, July 19, 2016. [Photo/VCG]

Despite threats of another chaotic day at the Quicken Loans basketball arena in Cleveland, anti-Trump Republican US Senator Mike Lee said efforts by some delegates to block Trump's nomination appeared finished.

"I don't see any way around it," the Utah lawmaker told Reuters.

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 four-day convention, which began on Monday, 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.

Republicans were also set on Tuesday to place in nomination Indiana Governor Mike Pence, 57, Trump's choice for his vice presidential running mate.