From The New York Times:
The Democratic National Committee is planning to file suit against the Federal Election Commission Monday in an effort to compel it to investigate Senator John McCain’s withdrawal from the public financing system for the primary.
The lawsuit, which is to be filed in United States District Court in Washington, is largely a procedural move, unlikely to change anything in the dispute in the immediate future. The D.N.C. filed a complaint with the commission in February, challenging Mr. McCain’s right to pull out of public financing.