Massachusetts Gov. Deval Patrick (D) is planning an announcement at 3 p.m. ET today regarding the Senate seat left vacant last week following the death of Edward Kennedy.

Currently, state law calls for a special election to be held between 145 and 160 days following a Senate vacancy. Patrick supports a change in the law that would give him the power to appoint an interim successor.

The state legislature, which reconvenes after Labor Day, is expected to begin deliberations that would attempt to change the law.

More after 3 p.m.

Tags: Washington Senators