Poll: Trump's Florida lead down to single digits
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Sen. Marco RubioMarco Antonio RubioOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Trump bets base will stick with him on immigration MORE (R-Fla.) has cut Donald TrumpDonald John TrumpBiden slams Trump over golf gif hitting Clinton Trump Jr. declines further Secret Service protection: report Report: Mueller warned Manafort to expect an indictment MORE's lead in Florida to single digits, according to a Monmouth University Poll released Monday.

Trump leads Rubio by 8 points in the senator's home state, 38 percent to 30 percent. 

It's a significant shift from earlier polls that found Trump with a double-digit lead. 

In a Public Policy Polling survey released last month, Trump held a 20-point lead. Similarly, he held in a 20-point lead in a One America News Network and Gravis Marketing poll released last month.

Florida is a must-win state for Rubio, who would not have much of a path to the GOP nomination without a victory in his home state.

The loss would also be a significant blow to Trump, given that Florida is a winner-take-all state awarding 99 delegates. 

The Monmouth poll finds Sen. Ted CruzRafael (Ted) Edward CruzSenate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea GOP state lawmakers meet to plan possible constitutional convention MORE (R-Texas) taking 17 percent and Ohio Gov. John Kasich winning 10 percent. 

Rubio leads the front-runner among the about 1 in 5 voters who have already cast their ballots, 48 percent to 23 percent. Trump leads among those who haven't voted yet, 42 percent to 26 percent.

In a hypothetical head-to-head vote between Trump and Rubio in the state, Trump still edges Rubio out, taking 47 percent of the vote to Rubio's 45 percent, according to the poll.

The poll was conducted by phone from March 3 to 6 among 403 Florida voters likely to vote in the Republican presidential primary. There is a margin of error of 4.9 percent.

Florida, which has 99 delegates at stake, will hold its primary on March 15.

The RealClearPolitics average of polls also shows Trump leading Rubio in Florida, but by a larger margin. Trump holds an 18.7 percent lead over the senator.

On Saturday, Rubio declined to say whether he will drop out of the race if he loses his home state primary.