Trump: Japanese Firm to Invest $50 Billion, Add 500,000 Jobs in US

Japanese telecommunications giant SoftBank Group plans to invest $50 billion in the U.S. economy and add 50,000 jobs, President-elect Donald Trump announced Tuesday.

Trump appeared in the lobby of the Trump Tower with Masayoshi Son, the chief executive of SoftBank, to announce the news, and later put it out on Twitter.

Son did not say what specific investments SoftBank would make. While talking to reporters, he held up a piece of paper with the same figures that Trump had announced, but which also specified that the investment would be made over the next four years.

Later Tuesday, Trump was to formally announce that he has chosen retired Marine General James "Mad Dog" Mattis for secretary of defense in a speech in North Carolina.

Mattis has served as the head of U.S. Central Command, which carries out U.S. operations in the Middle East, and the Supreme Allied Commander of NATO forces.

Michael O'Hanlon, a senior defense expert at the Brookings Institution, calls Mattis "one of the best read, best informed and most experienced generals of his generation."

Meanwhile, Trump, in his unlikely march to the White House, had campaigned on bringing more jobs to America, particularly in manufacturing regions hit hard by the recession and globalization.

The SoftBank deal is the second he has arranged to keep his promises to voters. Last week, he announced that the Carrier Manufacturing Corporation would keep about 1,000 jobs in Indiana instead of outsourcing them to Mexico.

'He would never do this had we (Trump) not won the election!' Trump later tweeted.

WATCH: Trump Touts $50 Billion Investment in US by Japanese Investor

Earlier this week outside Trump Tower, supporters of the three-state vote recount joined Green Party presidential candidate Jill Stein in a rally to ensure an 'accurate, secure, and fair' vote.

'We are here to assure Donald Trump that there is nothing to be afraid of,' Stein said. 'If you believe in democracy, if you believe in the credibility of your victory, put down your arms, end your bureaucratic obstruction, end your intimidation and join we the people of America who are calling for a democracy that serves all of us and elections that we can trust.'

A judge has ordered a hand recount begin in Michigan, one of three battleground states that Stein believes may have been hacked due to aging voting machines. Similarly, she is pushing for a federal court order to enact a recount in Pennsylvania.