"I will be making the announcement of my Vice Presidential pick on Friday at 11am (Saturday 1:00am AEST) in Manhattan. Details to follow," he announced on Twitter.
Mr Trump had a breakfast meeting on Wednesday with Indiana Governor Mike Pence, and later sat down for talks with former US House of Representatives Speaker Newt Gingrich.
His family met on Tuesday with New Jersey Governor Chris Christie, who speaks to Mr Trump on a near-daily basis.
