Democratic U.S. Senator Bob Casey is calling for an investigation into possible White House ties to Russia.  Casey called National Security Advisor Michael Flynn's resignation "the tip of the iceberg" yesterday, saying, "When any administration's national security apparatus is in chaos, it's a dangerous and troubling time for our country."  Republican U.S. Senator Pat Toomey also spoke about the issue, but instead focused on government leaks and whether the "intelligence community" illegally gathered information on Flynn.