SAN FRANCISCO — A decade of messy litigation involving sex tourism charges against a Bay Area businessman has spawned a bizarre malpractice suit against a pair of elite defense lawyers.

From a Puerto Vallarta prison cell, disgraced financier Thomas White is suing his former attorneys, Nanci Clarence and Kate Dyer, claiming they failed to adequately investigate his case and placed "outrageous pressure" on him to settle with plaintiffs who accused him of traveling to Mexico for sex with teenage boys. Clarence and Dyer represented White from roughly 2002 to 2005.