Former acting attorney general Sally Yates is expected to testify to U.S. Congress next week that she expressed alarm to the White House about President Donald Trump's national security adviser's contacts with the Russian ambassador, The Associated Press reported Tuesday.

According to the report, Yates is expected to recount in detail her January 26 conversation about Michael Flynn and is expected to say that she expressed alarm to White House counsel Don McGahn about Flynn's conversation with the Russian ambassador, Sergey Kislyak.