Foreigners seeking to buy American companies in areas like defense manufacturing typically seek the committee’s review themselves before going ahead with a purchase. Legal experts said it would be highly unusual for the panel to investigate a transaction like the Sequoia takeover, and even more unusual for the panel to try to nullify the transaction so long after it was completed.

It is unclear, moreover, what the government would need to uncover about the Sequoia sale to take such an action.

The investment committee’s review typically involves an initial 30-day examination of any transactions that might pose a threat to national security, including a collective assessment from the intelligence community. Should concerns remain, one of the agencies involved can request an additional and more rigorous 45-day investigation.

In the case of the ports deal, the transaction was approved by the investment committee. But the Dubai company later abandoned the deal, agreeing to sell out to an American company after a barrage of criticism by legislators from both parties who said the administration had not adequately reviewed the deal or informed Congress about its implications.

The concerns about possible ties between the owners of Smartmatic and the Chávez government have been well known to United States foreign-policy officials since before the 2004 recall election in which Mr. Chávez, a strong ally of President Fidel Castro of Cuba, won by an official margin of nearly 20 percent.

Opposition leaders asserted that the balloting had been rigged. But a statistical analysis of the distribution of the vote by American experts in electronic voting security showed that the result did not fit the pattern of irregularities that the opposition had claimed.

At the same time, the official audit of the vote by the Venezuelan election authorities was badly flawed, one of the American experts said. “They did it all wrong,” one of the authors of the study, Avi Rubin, a professor of computer science at Johns Hopkins University, said in an interview.