Virginia Gov. Bob McDonnell vetoed the General Assembly’s plan to re-draw the lines for the state’s 100 House and 40 Senate districts, writing to delegates that he has “significant concerns” that the Democratic Senate’s plans may violate state and federal law.

In his veto letter, McDonnell wrote that the districts proposed in the Senate’s plan do not properly preserve locality lines and communities of interest, and may violate the “one person, one vote” mandate in the U.S. and Virginia constitutions.