Sen. Marco Rubio may be near an announcement of a 2016 presidential campaign.
The Republican from Miami is expected to announce his presidential campaign within weeks, possibly as soon as April 13 at the historic Freedom Tower in downtown Miami.
Rubio's office said no firm plans on any announcement have been made.
"If you're going to run for president, you need sufficient time to raise the money and build the organization to be successful," Rubio said, adding that his decision would come "soon."
Sen. Rand Paul is set to make official a presidential bid that has long been expected, a senior adviser to the Kentucky Republican said Tuesday, pointing to April 7 as the kickoff date.
Paul's political team has invited backers to a midday event in downtown Louisville, Kentucky. The tea party hero was then set to visit the early nominating states of Iowa, New Hampshire, South Carolina and Nevada - familiar destinations for him as has prepared for the formal entry into the race.
The adviser demanded anonymity to speak ahead of Paul's public announcement. The adviser adds that Paul could still pull the plug on a campaign, although that is not expected to happen.
Paul has proved a formidable fundraiser, especially from low-dollar and younger donors who back his limited-government pitch. But Wall Street-style Republicans have been rushing to sign up with other likely candidates such as former Florida Gov. Jeb Bush, Wisconsin Gov. Scott Walker and Rubio.
Also, former Hewlett-Pacakrd CEO Carly Fiorina said on Sunday she is more than 90 percent likely to seek the Republican presidential nomination. Fiorina took to the airwaves Sunday, questioning the confidence people can have in likely Democratic contender Hillary Clinton.
Texas Republican Sen. Ted Cruz has become the first major candidate for president March 23, kicking off the anticipated rush of candidates' announcements.
Meanwhile, Paul's timing coincides with both the fundraising and political calendars. The second quarter of political fundraising opens on April 1, and several candidates are looking at formally joining the campaign soon after to take full advantage of the three-month window.
Candidates who join the campaign any time in April, May and June will have to report their fundraising tallies by July 15 and it will be one of the first benchmarks for a campaign's success. The sooner candidates declare in April, the more days they will have to collect checks.
Easter this year, however, is April 5 and many voters will not be paying attention to politics during that weekend.
Information from the Associated Press was used in this report.