Attempts have been made to hack Adrian Delia's Twitter account, the Nationalist Party said on Thursday.
It said attempts were made from different parts of Europe by unknown persons.
Immediate action was taken to thwart them.
The PN said this was the latest of a series of attacks on the Nationalist Party leader and it was clear that such malicious attacks were coordinated.
"This cyber attack was to be carried out at a time when the PN leader was speaking strongly about the way the government was giving public land for speculation and for construction and as he was speaking about the sale of the three hospitals."
The party said Dr Delia was determined to continue defending the rights of the people.