21. Phil, a citizen of Virginia, sues Darrell, a citizen of…

21. Phil, a citizen of Virginia, sues Darrell, a citizen of Maryland for breach of contract alleging $50,000 in damages.  Phil’s complaint also has claims for defamation and interference with prospective contractual relations, alleging damages in the amounts of $20,000 and $5,000, respectively.  May Phil sue Darrell on all causes of action in a federal court?