A New Jersey congressman says he will demand a government inquiry into Mikhail Prokhorov, the Russian billionaire poised to buy the New Jersey Nets, for his extensive business dealings in Zimbabwe -- a bombshell that could blow up the $200 million team deal and threaten the future of Brooklyn's Atlantic Yards

Prokhorov's Renaissance Capital investment bank has interests in the Zimbabwean stock exchange, banks, a cellphone company, mining and a swanky, private big-game reserve. The company is intertwined with Onexim, the $25 billion Prokhorov-controlled investment fund behind the deal to bring the struggling NBA team to Brooklyn.

Pascrell said he will ask the Treasury Department, which oversees the sanctions, to investigate Onexim. In 2008, Onexim became a 50 percent owner of Renaissance Capital, which has been actively investing in Zimbabwe since 2007.