so this kind of tactic is standard operating procedure for russian intelligence and robert mueller is absolutely right to explore it. and what's more, the president drawing a red line, these threats are powerful evidence of obstruction of justice. more evidence. >> if donald trump were to follow through on that threat, what mooilgt might on capitol hill? what would happen with your republican colleagues? >> as much as he's saying robert mueller might be crossing a line, i think president trump would be crossing a clear line and would provoke a fire storm, bipartisan, my republican colleagues i think would be outraged, along with the country. and what we'd see, i would help to lead it, is legislation creating a special prosecutor, much as happened in watergate, appointed by a three-judge panel that would be independent of the president of the united states.