The US attorney in New Jersey is set to open an inquiry into recent controversial bridge lane closures, which critics say were engineered by New Jersey Governor Chris Christie's staff for political retribution, The New York Times reported.
The newspaper gave no further details.
Christie is a possible Republican contender for the 2016 White House race.
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The US president questioned why it took the Alabama Republican candidate's accusers 40 years to come forward.
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Mladic, now 75, was the military commander of Bosnian Serb forces in the 1990s, who fought against the Bosnian Croat and Bosniak armies.