A developer filed a breach of contract action against a general contractor in federal district court. If the contract was breached, the general contractor believes the fault was that of the framing subcontractor. The general contractor thus intends to file a third-party claim against the subcontractor seeking indemnification for any sums the developer recovers from the general contractor. The general contractor also wants to assert a tort claim against the subcontractor for $80,000 worth of equipment belonging to the general contractor that the subcontractor took from a construction site on a different project. The developer is a citizen of State A, while both the general contractor and the subcontractor are citizens of State B. Which claims can the general contractor properly assert in the pending federal action