Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE increased his lead atop the GOP presidential field in a new national poll, attracting 49 percent support among Republican voters.

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Trump holds a 33-point lead over his closest competitor, Sen. Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE (R-Fla.), in a CNN/ORC International poll released Monday morning, one day before ballots are cast on Super Tuesday.

Rubio has 16 percent support in the new poll, followed by Sen. Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE (R-Texas) with 15 percent, Ben Carson with 10 percent and Ohio Gov. John Kasich with 6 percent.

Trump and Rubio gained 8 points apiece since a similar poll in late January, while Cruz lost 4 points.

Trump holds a more narrow 15.8-point lead over Cruz, 35.6 to 19.8 percent, in a RealClearPolitics average of national polls. Rubio then follows in third place with 17.4 percent support.

CNN/ORC conducted its latest poll of 427 Republican-leaning voters via cell and landline telephone interviews from Feb. 24 to 27. It has a 5 percent margin of error.

Pollsters also found that GOP voters are typically loyal toward their preferred candidate.

About 68 percent say they "definitely support" their favorite, contrasted by 32 percent who "might change" their minds.

Monday's results additionally showed that over half of registered Republican voters would back Trump should he clinch their party's nomination.

About 52 percent would rally behind the billionaire, with 25 percent "definitely" backing him and 27 percent "probably" supporting him.

About 35 percent, however, would "definitely not" back Trump as the nominee. Another 13 percent would "probably not" support him.

—This report was updated at 7:17 a.m.