The Liberal Democratic Party may be torn apart if Prime Minister Junichiro Koizumi goes ahead with his controversial plan to have four bills related to postal deregulation approved by the Cabinet on April 26, a top LDP policymaker warned Friday.

"If it is on April 26, the party will split up," Taro Aso, chairman of the LDP Policy Research Council, reportedly told a meeting of the LDP Executive Council.

Aso cited strong opposition toward the move from within the council's division overseeing postal services.