Koech, a former chairman of the Poverty Eradication Commission, said should the MP engage the party on the matter, it would first have to be tabled before the National Executive Council.
“NEC officials will weigh the value he will bring to the party as we have a clear process of recruiting members and picking a presidential candidate. The rules will be applied,” Koech said.
Mr Martin Kamwaro, the UDM Secretary-General said the party had attracted support both at the grassroots and national level as the clock ticks towards the March 4, 2013 election.
“ UDM has clearly demonstrated the era of sycophancy, dictatorship and impunity is long gone as we have a new constitutional and political dispensation. Ours is a party that welcomes everyone on board, that it is why a number of politicians are interested with joining the party,” Kamwaro said.
He added, “When a group of MPs joined the party over a year ago, they found us weak, but they left us stronger.”
Mr Stanley Rotich, the UDM Secretary of Labour, separately confirmed Jirongo and Kirwa among others have shown interest in joining the party.
“Jirongo, Kirwa and others have talked to us on the matter. As a party, our doors are open to those who share the same ideals, but whoever wants to be a presidential flagbearer will be subjected to a competitive process,” Rotich said.
He said grassroots elections will be held before the end of this month while national office bearers will be picked next month.
If Jirongo joins UDM, it will be the third time he will be associating with the party having founded it with Ruto and Kirwa during the Kanu era but later jumped ship to other parties.
Mogotio MP Hellen Sambili is the only UDM MP in Parliament.