I've told you that nomination petitions for state and federal office were due in Harrisburg on February 14. Objections to these petitions can be filed, but that must happen no later than today. These objections must state specifically why the nomination petition is being challenged and must be served on the state elections office.
Most (if not all) of these challenges would need to be filed in Commonwealth Court. The Court has set up a link to review objection petitions and case management orders.
As of Monday night, no petition has been legally challenged.
