The US government will conduct an extended review of Lenovo's planned acquisition of IBM's PC business to determine whether or not the deal threatens national security interests, according to The Wall Street Journal.

Earlier this week, three Republican congressmen sent a letter to US Treasury Secretary John Snow calling for an extended review of the $1.75 billion deal between China's Lenovo and IBM. That request appears to have been granted, according to the report, which cited an unnamed source.

The extended review will be conducted by the Treasury Department's Committee on Foreign Investment in the United States (CFIUS), an interagency panel that is chaired by Snow.