The Charlottetown Guardian, quoting unnamed sources, says the RCMP arrested the man Thursday and he is due in court Friday to face charges of threatening the life of the premier, as well as possession of weapons and possession of drugs.
The paper reports that the RCMP confirmed there had been an arrest, but would not confirm the charges the individual is facing or the name of that individual.
RCMP Cpl. Martin Roy offered no details on the case when reached by The Canadian Press, saying only that someone was to be in provincial court Friday to address a matter that has developed over the last few days.
Mary Moszynski, a communications officer with the provincial government, told The Canadian Press the premier's office relies on the RCMP for matters of safety.
But she said that since the matter was to be before the courts, she would not be able to comment further.
MacLauchlan was sworn in as premier on Monday following the resignation of Robert Ghiz.