X17 EXCLUSIVE - Michael Lohan Claims FBI's Sam Lutfi Investigation Is "BS", Calls Dina "The Grinch"

Michael Lohan is addressing the alleged FBI investigation on Sam Lutfi ... that Lindsay's mom, Dina, reportedly has organized. Various tabloid websites are claiming Lutfi has been sending the 24-year-old actress threatening and harassing text messages.

Papa Lohan, who calls the report "BS across the board," tells X17online exclusively:

"Bottom line is, Sam Lutfi hit the nail right on the head when he shared his opinion to Lindsay and my son Michael about Dina. It struck a sore cord. The truth hurt and Dina did NOT like it. From there, as usual, "The Grinch" stirred the pot with her broom stick.

People around Lindsay who, ironically, were the same people around BRITNEY are panicking for some reason. I think Sam and Adnon know to much. Tell me, why is it that the two people around Britney tell the SAME thing and they are the ones who had restraining orders slapped on them while a team was put in place to get conservatorship?? Light Bulb! Duh!!!"

Dina Lohan is reportedly venturing out west with Lindsay's sister Ali and brothers Michael and Cody to spend the holidays with Lindsay, and even though Papa Lohan isn't invited along, Michael tells us, "I plan and sure hope to see all of my children this Christmas, including Lindsay."

With all of this bickering going on, Christmas at the Lohans may not be so merry and bright.