Billionaire business tycoon Masayoshi Son said on Tuesday he would invest $50 billion in the United States and create 50,000 new jobs, a move President-elect Donald Trump claimed was a direct result of his election win.

The investment revived speculation that U.S. telecoms giant Sprint Corp., 82 percent-owned by Son's SoftBank Group Corp., might rekindle merger talks with T-Mobile U.S. Inc that died under pressure from U.S. regulators.

The lack of details on investment timetable also prompted doubts whether the promise of money and jobs will be met, as Sprint is slashing staff numbers to cut more than $2 billion in costs this year.