Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Senate Republicans Launch Investigation Into Origins of Russia Probe Katherine Gypson Former U.S. Deputy Attorney General Rod Rosenstein defended his decision to open a special counsel investigation into Russian interference in the 2016 election, telling a Senate panel Wednesday that while there was "reasonable suspicion" for the probe, he should not have signed an application for a surveillance warrant against a Trump campaign adviser. The Senate Judiciary Committee called Rosenstein in to testify about the origins of the FBI investigation into Russian interference in the 2016 election, the first step in a broader effort by the Republican-majority U.S. Senate to investigate alleged abuses on the part of Obama administration officials, as well as presumptive 2020 Democratic nominee, former Vice President Joe Biden. .