The Lehman Brothers Holdings bankruptcy trustee has sued Citibank to recover more than $1.3 billion, according to Dena Aubin’s March 18, 2011 article in Reuters. The $1.3 billion includes a $1 billion deposit demanded by Citibank to continue providing foreign exchange settlement services to Lehman’s broker subsidiary (LBI) after the bankruptcy filing. Citigroup also froze more than $300 million in additional deposits, and could face up to $3 billion in claims from Lehman’s bankruptcy proceedings, according to the article.