BUZZ-Valeant Pharmaceuticals International Inc: Congressman seeks interview
** Canadian drugmaker's U.S.-listed shares down 3.5 pct at $72.74; Canadian-listed shares down 3.4 pct at $97.16
** The top Democrat on a U.S. House of Representatives investigative panel is requesting interviews with a handful of executives at Valeant who were directly involved in the operations of specialty pharmacy Philidor
** "...Valeant employees may have been personally involved in questionable billing practices that led Valeant to cut ties with Philidor last month," House Oversight Ranking Democrat Elijah Cummings writes to CEO J. Michael Pearson
** Up to Friday's close, U.S. stock had fallen 32 pct since Valeant cut ties with Philidor, due to allegations related to the specialty pharmacy distributor's business practices
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