Polls released Sunday morning show real estate mogul Donald TrumpDonald John TrumpCNN's Camerota clashes with Trump's immigration head over president's tweet LA Times editorial board labels Trump 'Bigot-in-Chief' Trump complains of 'fake polls' after surveys show him trailing multiple Democratic candidates 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 RubioHillicon Valley: FTC reportedly settles with Facebook for B fine | Trump calls to regulate Facebook's crypto project | Court rules Pentagon can award B 'war cloud' contract | Study shows automation will hit rural areas hardest Court rules Pentagon can award B 'war cloud' contract later this summer Rubio asks White House to delay B Pentagon contract over Amazon concerns   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 CruzGOP senators ask for federal investigation into social media companies' decision-making The Hill's Morning Report - Presented by JUUL Labs - Trump attack on progressive Dems draws sharp rebuke Ted Cruz blasts Tennessee GOP governor for declaration honoring early KKK leader 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 ClintonTrump complains of 'fake polls' after surveys show him trailing multiple Democratic candidates Hillary Clinton responds to Trump tweets telling Dem lawmakers to 'go back' to their countries The Young Turks' Cenk Uygur: Here's how to choose a president MORE maintains her lead among potential Iowa Democratic caucus-goers and Sen. Bernie SandersBernie SandersTrump complains of 'fake polls' after surveys show him trailing multiple Democratic candidates The Hill's Morning Report - Presented by JUUL Labs - Trump attack on progressive Dems draws sharp rebuke Judd Gregg: Counting the costs of Democrats' desires 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 BidenJoe BidenTrump complains of 'fake polls' after surveys show him trailing multiple Democratic candidates Biden pitches new subsidies, public option in health care plan The Hill's Morning Report - Presented by JUUL Labs - Trump attack on progressive Dems draws sharp rebuke 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