The Malawi leader gave the warning in his speech to thousands of people that gathered at Katoto Roundabout in Mzuzu to welcome him on arrival in the Northern city.
President Mutharika reminded UTM leaders that section 4 of the Protected Names Act is there to protect the office of President among others.
“I want to warn Chilima, Masangwi, Kaliati and Callista Chapola. You better stop because there are laws in this country about despising a President,” warned President Mutharika.
Prof. Mutharika further said he was aware that the UTM leaders took turns to despise him during their recent political rallies.
He then asked his Democratic Progressive Party (DPP) leaders to go to communities to mobilise youth and women to vote for the party and have landslide victory during 2019 tripartite elections.
The President disclosed that his government had fulfilled a number of development projects in the Northern region and that soon he will commission Mzimba Water Project and Nthalire Rural Growth Centre.
“Let me thank you people of the Northern region for rallying behind the DPP and I ask you to continue,” appealed President Mutharika.
Speaking earlier, Minister of Transport and Public Works, Jappie Mhango assured the President of the Northern region's vote.
“People of the North have already made their decision on who to vote for and that is the DPP under your leadership,” Mhango said.