WASHINGTON — Former Florida Governor Jeb Bush will run for president in 2016, according to several senior aides who confirmed Thursday that the Republican would announce his widely expected decision in Miami later this month.

Bush senior aides confirmed that the 62-year-old Bush, who left the Florida governor's mansion in 2007, will enter the race during an event in Miami soon after returning from a weeklong European trip. The aides spoke on condition of anonymity to discuss the decision ahead of the formal announcement.

The son of one president and brother of another, the former Florida governor has the rank of front-runner and the donors to match. He now has eight months before the first votes are cast in the Iowa caucuses to prove he's worthy of both.

"It's as wide-open a race as we've seen in a long time," said Republican strategist Kevin Madden, who described Bush as the "technical front-runner" in a field that stands at 11 major declared candidates.

Among them: former Texas Gov. Rick Perry, who returned Thursday to presidential politics four years after his 2012 presidential bid ended in disaster, vowing during his own campaign kickoff to "end an era of failed leadership."

While both men were widely expected to enter the race, which got its unofficial start when Bush said in December he was exploring whether to seek the Republican nomination, the confirmation from aides that Bush will indeed run is nonetheless a defining moment for the Republicans.

The son of George H.W. Bush and younger brother of George W. Bush, he is a favorite of the Republican establishment, the experienced and well-connected party faithful who have showered the 62-year-old with money, staffing talent and encouragement in recent months.

His decision ensures the possibility of a general election showdown between two political dynasties as Hillary Rodham Clinton seeks the Democratic nomination.

Senior aides confirmed that Bush, who left the Florida governor's mansion in 2007, will enter the race June 15 during an event at Miami Dade College. They spoke on condition of anonymity so as not to take the edge off his formal announcement.

"I want to be the guy to beat," a confident Bush said while campaigning in Florida earlier this week.

The Republican contest now features candidates of different generations, races and genders, whose policy prescriptions are far from monolithic and whose personalities often clash. There are more to come: four sitting governors — Wisconsin's Scott Walker and New Jersey's Chris Christie, among them — are likely to join the race before the Republicans' first presidential debate in August.

"Everyone is bunched together in the polls, and no one candidate in particular has emerged as a clear leader in the early state contests," Madden said.

Perry opened his campaign in a fight for relevancy among the many Republicans trying to knock Bush from his front-runner position. Despite his record as Texas' longest-serving governor, Perry may struggle to reach the polling threshold that will decide the 10 candidates who will take part in the party's first debate on Aug. 6.

He announced his candidacy in a humid airport hangar alongside a C-130 cargo plane, like one he flew for the Air Force, and wasted little time in trying to distinguish himself from the swarm of Republican contenders not named Bush.

"Leadership is not a speech on the Senate floor," he declared in an apparent swipe at the four Republican senators in the race: Marco Rubio of Florida, Rand Paul of Florida, Ted Cruz of Texas and Lindsey Graham of South Carolina. "It's not what you say. It's what you do."

Madden, who previously worked for Mitt Romney, predicted that Bush's entry would prompt "more obvious head-to-head engagements among the candidates" as they jockey for position.

Eight current and former governors could ultimately be in the race, along with five current and former senators, a former neurosurgeon and two business executives.

The only woman in the Republican field, Carly Fiorina, has never held elected office, yet the former technology executive appears to be gaining momentum as she campaigns across early voting states including New Hampshire and South Carolina. There are two Hispanic candidates — Cruz and Rubio — while Bush is married to a Mexican native and speaks fluent Spanish. (AP)