Polls released Sunday morning show real estate mogul Donald TrumpDonald John TrumpDems flip Wisconsin state Senate seat Sessions: 'We should be like Canada' in how we take in immigrants GOP rep: 'Sheet metal and garbage' everywhere in Haiti MORE holding his leads in the early voting states of Iowa and New Hampshire, although those leads are smaller than one more ago.

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Trump leads former Hewlett Packard CEO Carly Fiorina among potential New Hampshire GOP primary voters by just 5 points, 21 to 16 percent, according to NBC News/Wall Street Journal/Marist pollsters.

Trump and Fiorina are trailed by former Florida Gov. Jeb Bush with 11 percent and Sen. Marco RubioMarco Antonio RubioOvernight Cybersecurity: Bipartisan bill aims to deter election interference | Russian hackers target Senate | House Intel panel subpoenas Bannon | DHS giving 'active defense' cyber tools to private sector Senators unveil bipartisan push to deter future election interference Puerto Rico's children need recovery funds MORE (Fla.) and retired pediatric neurosurgeon Ben Carson with 10 percent apiece.

In September, Trump led Ohio Gov. John Kasich, his closest competitor at the time in New Hampshire, by 16 points, 28 to 12 percent.

In Iowa, Trump now leads Carson by 5 points, 24 to 19 percent. Fiorina follows with 8 percent, Bush with 7 percent and Sen. Ted CruzRafael (Ted) Edward CruzWith religious liberty memo, Trump made America free to be faithful again Interstate compacts aren't the right way to fix occupational licensing laws Texas Dem: ‘I don’t know what to believe’ about what Trump wants for wall MORE (Texas), Rubio and Louisiana Gov. Bobby Jindal with 6 percent each.

One month ago, Trump led Carson by 7 points in the Hawkeye State, 29 to 22 percent.

Among Democrats, Hillary ClintonHillary Diane Rodham ClintonIntel Dem decries White House 'gag order' after Bannon testimony 'Total free-for-all' as Bannon clashes with Intel members Mellman: On Political Authenticity (Part 2) MORE maintains her lead among potential Iowa Democratic caucus-goers and Sen. Bernie SandersBernard (Bernie) SandersMellman: On Political Authenticity (Part 2) Former Sanders campaign manager: Don't expect email list to be shared with DNC Adult film star: Trump and Stormy Daniels invited me to 'hang out' MORE (I-V.) is still the leader among potential New Hampshire Democratic primary voters.

Clinton leads Sanders by 11 points, 47 to 36 percent in Iowa. Former Maryland Gov. Martin O’Malley has 4 percent. Clinton’s lead in the Hawkeye State is only 5 points when Vice President Joe BidenJoseph (Joe) Robinette BidenDemocrats will need to explain if they shut government down over illegal immigration Trump thinks he could easily beat Sanders in 2020 match-up: report Biden marks MLK Day: Americans are 'living through a battle for the soul of this nation' MORE is added to the field, however.

Sanders leads Clinton by 9 points, 48 percent to 39 percent, in New Hampshire in results that are virtually unchanged from a month ago. Biden gets 18 percent when added to the equation, while support for Sanders falls to 42 percent and Clinton gets 28 percent.

The NBC/WSJ/Marist polls were conducted Sept. 23-30. They have a 4.7 percent margin of error for potential Iowa GOP caucus-goers and a 5.3 percent margin of error for Democrats. In New Hampshire, their margin of error is 4.6 percent for potential GOP primary voters and 4.9 percent for Democrats.

Read more from The Hill:

Sanders maintains lead in New Hampshire