Donald J. Trump defeated Nikki Haley in the North Dakota Republican caucuses on Monday, according to The Associated Press, as he resumed his march to the nomination after a victory by Ms. Haley in the Washington, D.C., primary the day before.

The contest resumed Ms. Haley’s string of defeats in the nominating contests so far, most by double-digit margins, beginning with the Iowa caucuses in January and continuing through the Michigan primary last Tuesday.

Ms. Haley, a former governor of South Carolina, had briefly interrupted her losing streak with a victory in the nation’s capital, winning about 63 percent of the vote on Sunday. The contest was small — just over 2,000 Republicans voted in the overwhelmingly Democratic city — but awarded Ms. Haley 19 delegates, nearly doubling her total.

But it is unclear if Ms. Haley can win any of the coming state contests. North Dakota was the last state to hold a nominating contest before Super Tuesday, when 15 states will hold Republican primaries and caucuses that will distribute about a third of all delegates. Mr. Trump leads by wide margins in polls both nationally and in states that will vote on Tuesday. Recent polls in Texas, for example, show him with about 80 percent support.

While Mr. Trump won’t be able to clinch the nomination on Super Tuesday, a strong performance could put him very close to the majority of delegates he needs. If Ms. Haley doesn’t win some states soon, Mr. Trump could secure the nomination by the end of March.