Washington, D.C. ? The United States can expect a terrorist attack using nuclear or more likely biological weapons before 2013, reports a bipartisan commission in a study being briefed today to Vice President-elect Joe Biden.

It suggests the Obama administration bolster efforts to counter and prepare for germ warfare by terrorists.

“Our margin of safety is shrinking, not growing,” states the report, obtained by The Associated Press. It is scheduled to be publicly released Wednesday.

The commission is also encouraging the new White House to appoint one official on the National Security Council to exclusively coordinate U.S. intelligence and foreign policy on combating the spread of nuclear and biological weapons.

The report of the Commission on the Prevention of WMD Proliferation and Terrorism, led by former Sens. Bob Graham of Florida and Jim Talent of Missouri, acknowledges that terrorist groups still lack the needed scientific and technical ability to make weapons out of pathogens or nuclear bombs. But it warns that gap can be easily overcome, if terrorists find scientists willing to share or sell their know-how.