Pakistan Democratic Party chief Nawabzada Mansoor Ahmad Ali Khan will announce the merger of his party with Pakistan Tehreek-e-Insaaf here today (Monday). Sources in the PDP said the announcement will be made at a joint press conference by Imran Khan and Mansoor Ahmad Khan. Nawabzada Mansoor Ahmad Khan, son of late respected politician Nawabzada Nasrullah Khan, agreed to the merger after negotiations with the leadership of PTI.