According to The Washington Post, citing "current and former US officials", people on the transition team had warned Flynn about "the risks of his contacts with the Russian ambassador".
The public hearing will be the first featuring testimony by Obama administration officials who have left government. She also advised that Flynn's talk with Kislyak - which came the same day the Obama administration issued sanctions on Russian Federation - would compromise his position with Trump, according to the Associated Press.
According to CNN, however, Yates plans to insist that she warned the White House about Flynn's conversations with Kislyak and how he was misleading Pence, and was therefore susceptible to Russian blackmail.
The report says that Flynn was warned about speaking with Kislyak before the two discussed the possibilities of the United States lifting its sanctions on Russian Federation. Billingslea warned Flynn that it was likely Kislyak was being monitored by USA intelligence, and urged him to read the CIA profile. But he was not asked to resign until February 13, at least two weeks after Yates visited the White House.
Should Yates' testimony controvert the administration's version of events, new questions could emerge as to the integrity of the White House's public statements with respect to Flynn's resignation, and the actions of top Trump aides following the January 26 meeting.
Former Director of National Intelligence James Clapper is also scheduled to testify on Monday.
Senator Lindsey Graham, the subcommittee's chairman who called the hearing is a Russian Federation hawk and sometime critic of Trump who has been one of the leading Republican voices calling for a thorough investigation of Russian Federation and the election.
"Should Mr Page choose to not provide the material requested" by specified dates, they said, "the committee will consider its next steps". "But the whole situation is really unusual", Graham told CNN last month. The person spoke on condition of anonymity so as not to pre-empt the testimony.
While it's not inappropriate for someone in Flynn's position to have contact with a diplomat, Obama officials said the frequency of his discussions raised enough red flags that aides discussed the possibility Trump was trying to establish a one-to-one line of communication - a so-called back channel - with Russian President Vladimir Putin.
Congressional committees began investigating after USA intelligence agencies concluded that Russian President Vladimir Putin had ordered hacking of Democratic political groups to discredit the election and sway the voting toward Republican Trump, who won an upset victory in November.
Some White House advisers now privately concede that the administration moved too slowly during the election to publicly blame Russian Federation for the hack and explore possible ties to the Trump campaign. He handed the probe over to Rep. Mike Conaway in early April amid questions about his ability to lead an unbiased investigation.