County political leaders are expected to file suit in federal court today, challenging a congressional redistricting plan that divides Anne Arundel four ways.

Delegate Michael Busch, D-Annapolis, was expected to announce the suit today at an 8 a.m. news conference.

Busch is chairman of Anne Arundel County's 13-member House of Delegates contingent.

The county's State House delegation has opposedthe redistricting plan, which eliminates the Anne Arundel-dominated congressional seat held by three-term Democrat Tom McMillen, since the General Assembly adopted it Oct. 22.

Lawmakers said the plan improperly splits established communities, such as Crofton and Ferndale.

They also say they are are concerned that the interests of Anne Arundel, the state's fifth-largest subdivision, will be ignored because it does not have a majority in any district.

The county's Democratic and Republican parties are expected to pool their resources to challenge the plan, lawmakers said.