President Donald Trump has blasted a probe into his team's ties to Russia as an opposition "witch hunt," defending his former top aide Michael Flynn's decision to ask for immunity in the case. Trump's ex-national security adviser, whose links to Russia are one focus of the investigation, has sought protection in exchange for his testimony to the FBI and congressional committees. Flynn's lawyer said in a statement on Thursday that his client has "a story to tell, and he very much wants to tell it, should the circumstances permit". But two key committees in the probe, the House and Senate Intelligence Committees, both suggested the immunity proposal was premature. Trump nevertheless encouraged Flynn's move in a tweet on March 31. "Mike Flynn should ask for immunity in that this is a witch hunt (excuse for big election loss), by media & Dems, of historic proportion!" Flynn could be a key witness as the FBI, as well as the House and Sen...