Republican presidential candidate Donald Trump was forced to take a break off his campaign trail and make an emergency landing in Nashville, Tenn., after the pilot reported engine problems, officials said.

The Boeing 757 was en route to Little Rock, Ark., where Trump was supposed to attend a rally when the starboard engine experienced a mechanical issue, reported CBS News. One of the engines was allegedly stuck in neutral.

In describing the incident to traffic control, the pilot declared an emergency but declined to ask for assistance.

The plane landed at 4:40 p.m. at Nashville International Airport, according to the Federal Aviation Administration, noting that officials plan to investigate the incident, according to Reuters.

Trump boarded a small charter aircraft that took him the rest of the way, a campaign spokeswoman said. He arrived more than an hour-and-a-half late due to the diversion.

"That was a rough one," Trump said about the experience, according to CBS' Nashville affiliate WTVF-TV. "[It] was not easy with all the traffic and all the problems and mechanical and everything else."

In the meantime, the plane remains at the airport for repairs.

It is not yet clear whether the plane will be ready to fly Trump to the next primary in New Hampshire on Feb. 20.