The lawyer for a Queensland man who allegedly made an online threat against US president Barack Obama says he is waiting to see the police evidence about the allegations.

Jake Nicholas, 21, from Rockhampton in central Queensland, has been accused of using a carriage service to menace or harass.

He was arrested in Rockhampton last night and will appear in court next month.

His Rockhampton solicitor Doug Winning said he was waiting to see the police evidence.

"I will not discuss the operational details which resulted in this charge, but what I can say is that I've been engaged by a member of the Nicholas family to act for Jake Nicholas," he said.

"He will meet these allegations in a court but he won't discuss the matter in the court of public opinion.

"I'm yet to receive full instructions but when we view the evidence in its entirety, I intend to act according with his instructions.

"There's obviously a concern held by the Government at this sensitive time because the G20 is upon us, but my focus is to act in the best interests of my client and ... to deal with these allegations according to law."

Deputy Police Commissioner Ross Barnett said at a press conference this afternoon he could not make further comment on the matter.

"All I can say is the matter is now before the court, but the individual concerned we don't believe posed any threat to the safety of the president," he said.