GOP presidential front-runner Donald TrumpDonald TrumpTrump campaign dismisses Dem attacks as ‘night of empty rhetoric’ Obama makes case for Clinton to succeed him FULL SPEECH: President Obama at the Democratic convention MORE now has the support of 40 percent of registered Republicans, gaining 4 points in an NBC News/Survey Monkey national weekly tracking poll to reach a new high just before voters go to the polls on Super Tuesday.
Ted CruzTed CruzGrassroots battling establishment on trade at conventions Fixing the disastrous nomination process Attacking Trump for the few sensible things he says is bad strategy MORE, who’s in third place, slipped 1 point, to 18 percent, his lowest level in the survey.
Ben Carson ranks fourth, with 8 percent, while John Kasich follows, with 7 percent.
Pollsters also found that the overwhelming majority of GOP voters believe Trump will win their party's nomination.
About 71 percent predict Trump will become the Republican standard-bearer, up 15 points from a similar survey last week.
Rubio ranks second on that question, at 12 percent, while Cruz takes 10 percent, Carson 2 percent and Kasich 1 percent.
NBC News/Survey Monkey polled 8,759 registered Republican voters between Feb. 22 and 28. Their survey has a 1.8 percentage point margin of error.
Updated at 7:14 a.m.