As doubts about the legality of foreclosure proceedings continue to grow, Treasury secretary Timothy Geithner said a nationwide foreclosure freeze would do more harm than good, Bloomberg reports.

Speaking to PBS's Charlie Rose, Geithner, who called the foreclosure crisis "a national tragedy," said a moratorium could further depress housing prices and said it would be "very damaging to exactly the kind of people we're trying to protect," according to the transcript of his remarks (hat tip to Politico). A nationwide freeze could prevent foreclosed properties from being sold, and, as Geithner noted, unoccupied houses tend to hurt the value of their neighbors.

President Obama's top adviserr David Axelrod has also said he was "not sure" about a national moratorium. Both Axelrod and Geithner warn that such a move could cause collateral damage to valid foreclosure processes. Geithner told Rose "we're not going to make the problem worse."