At a campaign rally March 7 in Concord, N.C., Donald Trump holds up notes showing a March 1 CNN poll where he held a commanding lead over Marco Rubio and Ted Cruz. An ABC/Washington Post poll released the following day shows his lead shrinking. | Getty Trump slides in national GOP poll

Donald Trump's standing among Republican registered voters nationwide fell slightly in the latest ABC News/Washington Post national poll released Tuesday.

Trump, who earned 34 percent (down 3 points from January), is losing steam to Texas Sen. Ted Cruz, up four points from the last survey, conducted in January, to 25 percent. Florida Sen. Marco Rubio came next with 18 percent, while Ohio Gov. John Kasich finished last with 13 percent.


Trump falls short against Cruz and Rubio when matched one-on-one, by 13 points and six points, respectively.

As far as a contested convention is concerned, 53 percent of Republican and Republican-leaning independents said they would oppose such an outcome, with 42 percent supporting. Among those not supporting Trump, however, 63 percent said they would like the Cleveland convention to be a contested one, while just 30 percent in that camp would oppose.

On the Democratic side, Hillary Clinton holds a narrow seven-point advantage over Bernie Sanders — 49 percent to 42 percent. Both candidates hold similar favorability ratings. Her edge is down from a 19-point advantage — 55 percent to his 36 percent— in the previous poll.

Langer Research Associates conducted the poll via landlines and cellphones from March 3-6, among a random national sample of 1,000 adults with an overall margin of error of plus or minus 3.5 percentage points. The exact number of Republican and Democratic voters was not available in the initial release data, though the margin of error among Republicans is plus or minus 5.5 percentage points and plus or minus 6 percentage points among Democrats.