Treasury Secretary Timothy Geithner pledged to rein in the U.S. deficit as China underscored concern about preserving the value of its $801.5 billion of Treasury holdings.The U.S. will ensure a “sustainable” deficit by 2013, Geithner said at the beginning of the first round of Strategic and Economic Dialogue talks under President Barack Obama in Washington.The new focus on the deficit and Treasuries reflects the legacy of China’s record trade surpluses and its accumulation of dollars as a result of holding down the yuan.Assistant Finance Minister Zhu Guangyao also said China favors a “stable” dollar, indicating one source of concern is any collapse in the value of the U.S. currency.The dollar has dropped about 3.5 percent against the currencies of major trading partners this year -Rob Delaney & Rebecca Christie/Bloomberg