Donald Trump was officially nominated the Republican candidate for the U.S. presidential election on Tuesday, completing a meteoric rise from an outsider who was once considered a joke.

The real-estate mogul received a total of 1,725 delegates, well over the majority of 1,237 needed, in the state-by-state roll call vote on the second day of a four-day national convention held at the Quicken Loans Arena in Cleveland, Ohio.

"Such a great honor to be the Republican Nominee for President of the United States. I will work hard and never let you down! AMERICA FIRST!," Trump posted on Twitter after House Speaker Paul Ryan declared Trump the party's nominee.

Trump is scheduled to deliver a speech accepting the nomination on Thursday, the final day of the convention, in which he is expected to outline his ideas to retake presidency from the Democratic Party for the first time in eight years.

Trump's running mate Indiana Gov. Mike Pence was also nominated as the party's vice presidential candidate.

Trump has unnerved foreign countries, especially such allies as South Korea and Japan, as he has displayed deeply negative views of U.S. security commitments overseas, contending the U.S. should stop being the police of the world.

He has claimed that it makes no sense for the U.S. to help defend such wealthy allies as South Korea, Japan and Saudi Arabia in exchange for almost nothing. He argued that allies should pay 100 percent of the cost of stationing American troops, or the U.S. should be prepared to end their protection. He even suggested allowing South Korea and Japan to develop their own nuclear weapons for self-defense so as to reduce U.S. security burdens.

About 28,500 American troops are stationed in South Korea to deter North Korean aggression, a legacy of the 1950-53 Korean War, which ended in a truce, not a peace treaty. Many agree that the troop presence is also in line with U.S. interests in a region marked by China's rise.

Trump has also been highly critical of free trade agreements.

In an economic policy speech last month, Trump claimed that the free trade deal with South Korea expanded U.S. trade deficits and cost American jobs. He called the pact, which has been in effect since 2012 and is considered a symbol of the economic alliance between the two countries, "a job-killing deal."

That has sparked concern that if elected, he could seek to renegotiate the landmark deal.

Trump also vowed to pull out of the yet-to-be-ratified, 12-nation Trans Pacific Partnership if elected president. On top of that he said he would immediately renegotiate the North American Free Trade Agreement to get a better deal, and withdraw from the deal unless Canada and Mexico agree to a renegotiation. (Yonhap)