Jeb Bush to join crowded 2016 GOP presidential field June 15
Former Florida Governor Jeb Bush speaks on stage with conservative political commentator Sean Hannity at the annual Conservative Political Action Conference (CPAC) at National Harbor, Maryland, outside Washington, on February 27, 2015 (AFP Photo/Nicholas Kamm)

Jeb Bush will announce his bid for the Republican presidential nomination on June 15 in Miami, finally jumping into the crowded field after a chorus of criticism about how he is handling his non-campaign and moving to bolster his support.

The former Florida governor's big event in his hometown will come shortly after he completes a week-long trip to Germany, Poland and Estonia. The announcement on Thursday of a date follows several polls that showed his front-runner status has been diminished.

Some in the Bush camp had suggested he might wait until July to announce his bid, which would give him even more time to raise money for the Right to Rise Super PAC organization that will run key parts of his campaign.

But amid questions about his delay in announcing and whether he was skirting election fundraising laws, the decision was made to go in mid-June.

“Coming soon ...," Bush said on his Twitter account, linking to a new website. A companion message was posted in Spanish.

Like many other Republicans this year who gave a date for their announcement, Bush did not specifically say he will run.

But he has left no doubt in recent days about his intentions. A Bush aide said his event will be at Miami-Dade Community College.

Bush's campaign will be run out of Miami but the Right to Rise Super PAC will be based in Los Angeles and led by Bush chief strategist Mike Murphy.

Bush began his exploration of a presidential bid late last year and quickly rose to the top of opinion surveys of Republican voters. But he has sagged a bit of late.

A Fox News poll this week had him tied for the lead at 12 percent with Wisconsin Governor Scott Walker, who is expected to announce in coming weeks.

"We expect that should he (Bush) get into this race that it’s going to be very competitive from the start and it’s going to be a very long race," said Bush spokesman Tim Miller. "It’s obviously a very big field and also a field of very talented Republicans. That's just the reality of the state of play."

Bush, the son of former President George H.W. Bush and brother of former President George W. Bush, is entering a wide-open race for the nomination, with former Texas Governor Rick Perry the latest to join on Thursday.

Bush, 62, most represents the establishment wing of his party and wants to expand the reach of Republicans, who have lost the last two presidential elections and are seen as facing an uphill battle in 2016.

Conservatives have been slow to warm to him, concerned about his moderate positions on illegal immigration and Common Core education standards.

Their chilliness could complicate his campaign in Iowa, which early next year holds the first Republican nominating contest to choose a standard-bearer to face the Democratic nominee in the November 2016 election.

Officially forming his campaign will allow Bush to concentrate more on strategy and to flesh out a vision for why he wants to be president.

His recent days-long effort to explain what he would do differently than his brother in Iraq raised eyebrows among some Republicans.

"I think he hasn't gotten his footing," said a veteran Republican leader in Washington, who spoke on condition of anonymity. "He hasn’t been firm in his message. He hasn’t articulated his principles. He stumbled on the Iraq thing."

"And he's not aggressive enough. He seems fairly laid back and of course laid back isn’t the way you want to approach the voters for your initial impression," he said.

He also faces a home-state challenge from Republican Senator Marco Rubio, 44, who has sent a pointed message to Bush by saying the party needs a new generation of leaders.

Following the June 15 event, Bush plans to go on a tour of states with early presidential nominating contests, with stops planned in New Hampshire, Iowa, South Carolina and Nevada, a Bush aide said.

(Additional reporting by Michelle Conlin, Emily Flitter and Lisa Lambert; Writing by Steve Holland; Editing by Jeremy Gaunt, Bill Trott, Jeffrey Benkoe and Eric Walsh)