AP Source: Trump aide in frequent contact with Russia envoy

FILE - In this Sept. 6, 2013 file photo, Russia's ambassador to the U.S. Sergey Kislyak, speaks with reporters in Washington. The Obama administration is aware of frequent contacts between President-elect Donald Trump’s top national security adviser Michael Flynn and Russia’s ambassador to the United States, including on the day President Barack Obama hit Moscow with sanctions in retaliation for election-related hacking, a senior U.S. official said Friday, Jan. 13, 2017. (AP Photo/Cliff Owen, File) (The Associated Press)

FILE - In this Nov. 14, 2016 file photo, Sean Spicer arrives at Trump Tower in New York. The Obama administration is aware of frequent contacts between President-elect Donald Trump’s top national security adviser Michael Flynn and Russia’s ambassador to the U.S., including on the day President Barack Obama hit Moscow with sanctions in retaliation for election-related hacking, a senior U.S. official said Friday, Jan. 13, 2017. (AP Photo/ Evan Vucci, File) (The Associated Press)

FILE - In this Dec. 12, 2016 file photo, National Security Adviser-designate Michael T. Flynn waits for an elevator in the lobby at Trump Tower in New York. The Obama administration is aware of frequent contacts between President-elect Donald Trump’s top national security adviser Michael Flynn and Russia’s ambassador to the United States, including on the day President Barack Obama hit Moscow with sanctions in retaliation for election-related hacking, a senior U.S. official said Friday, Jan. 13, 2017. (AP Photo/Kathy Willens, File) (The Associated Press)