Presumptive Republican presidential candidate Donald Trump has conducted last-minute talks with his top potential picks for his vice presidential running mate, saying he would announce his choice on Saturday (AEST).
"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.
In addition, US Senator Jeff Sessions, 69, of Alabama, a fourth potential candidate for the VP spot and a close adviser to Mr Trump, was seen going into the Conrad Hotel in Indianapolis, where Trump was recently located.
A source close to the campaign said Mr Trump appeared to be leaning toward Mr Pence, but that he could always change his mind.
Mr Trump seemed to be trying to decide between Mr Pence and Mr Gingrich, the source added.
The New York businessman is to be formally nominated at the Republican National Convention next week in Cleveland.
Traditionally, the vice presidential choice is used to build enthusiasm among party loyalists.
Mr Trump has campaigned with all three in recent days as he readies for perhaps the most consequential decision of his campaign ahead of the November 8 election.
Indiana governor the safest choice for Trump
Governor Pence, who faces a conflicting deadline on whether to have his name on the ballot to seek another term, said he was humbled to be considered for Mr Trump's running mate.
"I think he's giving it very careful consideration, and we're humbled to be a part of that," he said.
"There are a number of other noteworthy Americans that they are considering, and I'm just honoured to be on that list."
In a sign of how seriously the campaign is considering Governor Pence, Mr Trump was joined at the Governor's residence for breakfast by his daughter Ivanka, son-in-law Jared Kushner and sons Donald Trump Jr and Eric Trump.
Mr Kushner and Mr Trump's children have played important roles in the campaign.
Mr Trump, who wants an experienced politician to join him on the ticket, campaigned with Governor Pence at a rally on Tuesday night in Westfield, Indiana.
The 57-year-old former congressman, who has flirted in the past with a presidential run of his own, would perhaps be the safest choice for Mr Trump given the Governor's popularity among conservatives and his experience in government. He would also bring Midwestern appeal.
Mr Trump is clearly comfortable with both Mr Gingrich and Governor Christie, a factor that Trump advisers say is important to him.
Both have been supportive of Mr Trump throughout much of his bitter feud with establishment Republicans.
Mr Gingrich is popular among many Trump advisers because of his grasp of policy and his counsel. He was House speaker when Democrat Bill Clinton was president in the 1990s when they achieved welfare reform, among other legislative achievements.
"Trump has staked his candidacy on revolutionary change in Washington, and there is no one being considered who has actually achieved revolutionary change like Newt Gingrich," said Rick Tyler, a former spokesman for Mr Gingrich.
"If Trump picks him, I'll know that Trump is serious about reforming Washington."
But at age 73, Gingrich could have trouble appealing to younger voters. Trump is 70 and Governor Christie is 53.
But the Governor has had a couple of missteps as Indiana's chief executive. A religious freedom law he signed had to be revised because it was seen as discriminating against gays and lesbians, and he had to abandon plans to create a state-run news agency.