Mr. Siakalima says the party will not be intimidated by the methods President Sata and Mr Mwamba are allegedly using to lower and attack the UPND leader.
Mr. Siakalima has also called on the Zambia Police to be professional in their operations warning that they will pay for the misery they are causing on the opposition.
And UPND Southern Province Chairman Hilliard Makweembo has accused President Sata of resorting to harassing Mr. Hichilema because he is feeling the pressure the UPND is mounting on him.
Mr. Makweembo says there is no doubt that President Sata has become dictatorial and thrown away the confidence the Zambian people had put in him.
He says there is need for the president to allow democracy which was hard earned to flourish in the country.