MANCHESTER, N.H. — Florida Sen. Marco Rubio is on the rise in New Hampshire, and closing in on Republican presidential front-runner Donald Trump, less than four days before voters are set to cast their ballots in the state's first-in-the-nation primary.

According to a new Suffolk University-Boston Globe poll released Friday, the 44-year-old Cuban-American senator is up to 19 percent support among Granite State Republicans. Rubio continues to trail Trump, who draws 29 percent support in the latest survey, but the billionaire's lead has begun to shrink since he finished second behind Texas Sen. Ted Cruz in the earliest voting state.

In addition to the momentum he had from Iowa, Rubio has received three influential endorsements this week from Republican Sens. Pat Toomey, Pa., and Tim Scott, S.C., and former GOP presidential candidate Rick Santorum, who exited the race on Wednesday. Trump, meanwhile, has yet to receive an endorsement from any member of Congress or sitting governor.

"What a difference a caucus makes," David Paleologos, director of the Political Research Center at Suffolk University, said in a statement. "By exceeding expectations in Iowa, Marco Rubio is converting likability to electability even more so than Ted Cruz, who, like many conservative Iowa winners of the past like Mike Huckabee and Rick Santorum, can't seem to convert an Iowa win into a major showing in New Hampshire."

In third place, behind Trump and Rubio, is Ohio Gov. John Kasich (13 percent). Kasich previously told the Washington Examiner his campaign would be "game over" if he doesn't perform well in New Hampshire's Feb. 9 primary. Former Florida Gov. Jeb Bush is fourth, at 10 percent, Cruz fifth at 7 percent and New Jersey Gov. Chris Christie comes in sixth at just 5 percent support.

The survey also found that one-third of likely Republican primary voters could choose to support a different candidate between now and next Tuesday. Fifty-eight percent were firmly committed to their current candidate-of-choice and 9 percent of respondents remain undecided.

The survey of 500 likely New Hampshire primary voters was conducted between Feb. 2-4. Results contain a margin of error plus or minus 4.4 percent.