The warning follows a violent attack that the Nima residence of the party's flagbearer, Nana Akufo-Addo, by some members of the governing National Democratic Congress.
In a statement, Mr Boadu said the NPP will use every constitutional force to protect themselves and their properties.
"...we want to send a strong warning to the President. We shall not be intimidated. We shall not be assaulted. We will use every constitutional force to protect ourselves and our properties. We believe we have a responsibility to protect our democracy and the only way to do so is not to allow the instruments of violence to have their way," the statement said.
Mr Boadu said the motive for the attack is "to assault the household and create an enhanced atmosphere of fear within Ghana, 24 days to the election. This action was premeditated and unquestionably violent."
He further warned that the party resist all violence against members of the party.
Early on, the party's Director of Communications denounced the attacked saying "the motive for the attack is to create an atmosphere of fear within Ghana 24 days to the election."
Nana Akomea also called on the Peace Council and the Civil Society Organisations to condemn the act since it is a threat to the country's democracy.
"Such behavior is a threat to the integrity of our democracy and must not be tolerated. We call on the National Peace Council, the Christian Council, and all Civil Society Organisations to let their voices be heard in condemnation of this violent act," he said.
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