The administration has been fending off questions about a senior aide's attempt to set up a secret back channel of communication with Moscow in the weeks before Trump was took office. White House adviser Jared Kushner, Trump's son-in-law, met in December with Russia's ambassador to the U.S. and discussed whether a secret line of communication could be used to facilitate sensitive policy discussions about the conflict in Syria, according to a person familiar with the talks. The person demanded anonymity because the person was not authorized to discuss the sensitive conversation by name.