Grains end lower for a third day, with livestock mixed.  Shawn Hackett of Hackett Financial Advisors says the weakness in grains is coinciding with the strength in the dollar in what he calls the "Trump Factor".  He expects more volatility ahead as the markets sort through news regarding tariffs, trade, Trump appointees and the like.  Weather is in the background with favorable conditions in South America and winter wheat areas of the U.S. giving the market another reason to slide and wheat has made new lows for the move in the process.  Cattle futures ended mixed and may stay sideways for a bit according to Hackett, while hogs made contract highs Tuesday and have probably topped.