Bush backers flock to Rubio
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Lawmakers are flocking to support Marco RubioMarco RubioBush ethics lawyer: Congress must tell Trump not to fire Mueller The private alternative to the National Flood Insurance Program  Cruz offers bill to weaken labor board's power MORE's White House campaign after former Florida Gov. Jeb Bush dropped out of the GOP race on Saturday.

A slew of Republicans in Congress who previously backed Bush are moving to support Rubio as he battles GOP rivals Donald TrumpDonald TrumpTrump claims Trump Jr. 'openly gave his emails to the media' Trump: Mueller and Sessions should investigate Clinton ties to Russia OPINION | How Chris Christie went from America's straight shooter to Trump's crooked yes-man MORE, Sen. Ted CruzTed CruzEx-CBO directors defend against GOP attacks on ObamaCare analysis Cruz: GOP will 'look like fools' if ObamaCare isn’t repealed The GOP Wonder Women who saved healthcare for 22 million MORE (Texas) and Ohio Gov. John Kasich.

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Rubio's campaign announced ahead of Tuesday's caucus in Nevada that Sen. Dean HellerDean HellerPro-ObamaCare group targets key senators in new ads Overnight Healthcare: CBO predicts 22M would lose coverage under Senate ObamaCare replacement 40 million fewer people expected to vote in 2018, study finds MORE (Nev.) and Rep. Mark AmodeiMark AmodeiTrump’s EPA budget cuts hit strong opposition at House panel Healthcare vote puts Heller in a bind Liberal group funds 0K in attack ads after healthcare vote MORE (Nev.) would be backing his campaign.

Florida Reps. Carlos Curbelo, Mario Díaz-Balart, Ileana Ros-Lehtinen, Gus Bilirakis and Jeff Miller, all former Bush backers as well, announced their support for Rubio on Monday afternoon.

Sen. Orrin HatchOrrin HatchSenate panel advances Trump's tax policy nominee Healthcare debacle raises pressure for GOP on taxes GOP frets over stalled agenda MORE (R-Utah) also endorsed Rubio after earlier backing Bush, and noted that he had a "rough time" not picking the Florida senator initially. 
 
"Marco is a super outstanding member of the Senate but he's had a great deal of experience—he was speaker of the House down there in Florida," he told reporters, adding that he's "honest, energetic and trustworthy." 

Rubio is hoping to shore up support among more of Bush’s supporters, who are also eyeing Kasich as a potential alternative to Trump, the clear front-runner in the GOP race.

“As much as I love John Kasich, you know, Rubio is probably a better candidate. And he’s young,” former GOP nominee Bob Dole told ABC News on Monday in announcing his support of Rubio.

"He wants to grow the party as opposed to [Ted] Cruz. I don’t know what he wants to grow," Dole added.

Rubio narrowly edged Cruz for second place in South Carolina, marking his comeback after a disappointing fifth place finish in New Hampshire earlier this month.

Rubio’s backers have characterized the Florida senator as a unifying force in the GOP race as lawmakers and donors scramble to encircle an alternative to Trump and Cruz.

“America needs a president who will take on the status quo, establishment and entrenched interests that are standing in the way of a better future for our people, and Marco will be that kind of president,” Miller said in a statement Monday shared with The Hill.

Miller, the chairman of the House Veterans Affairs Committee, praised Rubio’s work in the Florida legislature, saying, “Marco has stood with me in fighting for our veterans and holding the VA accountable for the unforgivable scandals and abuses we’ve seen in recent years.”

The growing number of endorsements for Rubio also helps gin up attention for the candidate as he spars for the spotlight with Cruz and Trump, but it's unclear how much they will affect the race in a year where candidates who have positioned themselves as political outsiders have held an edge.

Republicans acknowledge that Rubio and others face a difficult path to the nomination in the face of Trump, who remains a dominant force with wins in New Hampshire and South Carolina. 

House Majority Leader Kevin McCarthy (R-Calif.) said early Monday that while he sees a two-person race between Trump and Rubio, there's more than a "50 percent chance" that Trump will be the nominee.